diff --git a/Factories.meta b/Factories.meta
new file mode 100644
index 0000000..5cf0144
--- /dev/null
+++ b/Factories.meta
@@ -0,0 +1,9 @@
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+guid: 354b7801c1d782b47b5d9ff9aba85e83
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+timeCreated: 1434752394
+licenseType: Free
+DefaultImporter:
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diff --git a/Factories/IGameObjectFactory.cs b/Factories/IGameObjectFactory.cs
new file mode 100644
index 0000000..f7231da
--- /dev/null
+++ b/Factories/IGameObjectFactory.cs
@@ -0,0 +1,12 @@
+using UnityEngine;
+
+namespace Svelto.Factories
+{
+    public interface IGameObjectFactory
+    {
+        void RegisterPrefab(GameObject prefab, string type, GameObject parent = null);
+
+        GameObject Build(string type);
+        GameObject Build(GameObject go);
+    }
+}
diff --git a/Factories/IGameObjectFactory.cs.meta b/Factories/IGameObjectFactory.cs.meta
new file mode 100644
index 0000000..dc6c4b9
--- /dev/null
+++ b/Factories/IGameObjectFactory.cs.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
+guid: f3720a403a14c51489b5250365b7185c
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
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diff --git a/Factories/IMonoBehaviourFactory.cs b/Factories/IMonoBehaviourFactory.cs
new file mode 100644
index 0000000..cbf5e05
--- /dev/null
+++ b/Factories/IMonoBehaviourFactory.cs
@@ -0,0 +1,11 @@
+using System;
+using UnityEngine;
+
+namespace Svelto.Factories
+{
+	public interface IMonoBehaviourFactory
+	{
+		M Build<M>(Func<M> constructor) where M:MonoBehaviour;
+	}
+}
+
diff --git a/Factories/IMonoBehaviourFactory.cs.meta b/Factories/IMonoBehaviourFactory.cs.meta
new file mode 100644
index 0000000..1a2f1b4
--- /dev/null
+++ b/Factories/IMonoBehaviourFactory.cs.meta
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diff --git a/LICENSE.meta b/LICENSE.meta
new file mode 100644
index 0000000..0999b4e
--- /dev/null
+++ b/LICENSE.meta
@@ -0,0 +1,8 @@
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diff --git a/README.md.meta b/README.md.meta
new file mode 100644
index 0000000..cabd763
--- /dev/null
+++ b/README.md.meta
@@ -0,0 +1,8 @@
+fileFormatVersion: 2
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+licenseType: Free
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diff --git a/Utilities.meta b/Utilities.meta
new file mode 100644
index 0000000..0f482d6
--- /dev/null
+++ b/Utilities.meta
@@ -0,0 +1,9 @@
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+timeCreated: 1440947158
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diff --git a/Utilities/DesignByContract.cs b/Utilities/DesignByContract.cs
new file mode 100644
index 0000000..f69b621
--- /dev/null
+++ b/Utilities/DesignByContract.cs
@@ -0,0 +1,543 @@
+// from: http://www.codeproject.com/Articles/1863/Design-by-Contract-Framework
+// Provides support for Design By Contract
+// as described by Bertrand Meyer in his seminal book,
+// Object-Oriented Software Construction (2nd Ed) Prentice Hall 1997
+// (See chapters 11 and 12).
+//
+// See also Building Bug-free O-O Software: An Introduction to Design by Contract
+// http://www.eiffel.com/doc/manuals/technology/contract/
+// 
+// The following conditional compilation symbols are supported:
+// 
+// These suggestions are based on Bertrand Meyer's Object-Oriented Software Construction (2nd Ed) p393
+// 
+// DBC_CHECK_ALL           - Check assertions - implies checking preconditions, postconditions and invariants
+// DBC_CHECK_INVARIANT     - Check invariants - implies checking preconditions and postconditions
+// DBC_CHECK_POSTCONDITION - Check postconditions - implies checking preconditions 
+// DBC_CHECK_PRECONDITION  - Check preconditions only, e.g., in Release build
+// 
+// A suggested default usage scenario is the following:
+// 
+// #if DEBUG
+// #define DBC_CHECK_ALL    
+// #else
+// #define DBC_CHECK_PRECONDITION
+// #endif
+//
+// Alternatively, you can define these in the project properties dialog.
+
+#if UNITY_EDITOR || ROBO_TEST_BUILD
+#define DBC_CHECK_ALL  
+#endif
+  
+using System;
+using System.Diagnostics;
+
+namespace DesignByContract
+{
+	/// <summary>
+	/// Design By Contract Checks.
+	/// 
+	/// Each method generates an exception or
+	/// a trace assertion statement if the contract is broken.
+	/// </summary>
+	/// <remarks>
+	/// This example shows how to call the Require method.
+	/// Assume DBC_CHECK_PRECONDITION is defined.
+	/// <code>
+	/// public void Test(int x)
+	/// {
+	/// 	try
+	/// 	{
+	///			Check.Require(x > 1, "x must be > 1");
+	///		}
+	///		catch (System.Exception ex)
+	///		{
+	///			Console.WriteLine(ex.ToString());
+	///		}
+	///	}
+	/// </code>
+	/// If you wish to use trace assertion statements, intended for Debug scenarios,
+	/// rather than exception handling then set 
+	/// 
+	/// <code>Check.UseAssertions = true</code>
+	/// 
+	/// You can specify this in your application entry point and maybe make it
+	/// dependent on conditional compilation flags or configuration file settings, e.g.,
+	/// <code>
+	/// #if DBC_USE_ASSERTIONS
+	/// Check.UseAssertions = true;
+	/// #endif
+	/// </code>
+	/// You can direct output to a Trace listener. For example, you could insert
+	/// <code>
+	/// Trace.Listeners.Clear();
+	/// Trace.Listeners.Add(new TextWriterTraceListener(Console.Out));
+	/// </code>
+	/// 
+	/// or direct output to a file or the Event Log.
+	/// 
+	/// (Note: For ASP.NET clients use the Listeners collection
+	/// of the Debug, not the Trace, object and, for a Release build, only exception-handling
+	/// is possible.)
+	/// </remarks>
+	/// 
+	public sealed class Check
+	{
+		#region Interface
+
+		/// <summary>
+		/// Precondition check.
+		/// </summary>
+		[Conditional("DBC_CHECK_ALL"), 
+		Conditional("DBC_CHECK_INVARIANT"), 
+		Conditional("DBC_CHECK_POSTCONDITION"), 
+		Conditional("DBC_CHECK_PRECONDITION")]
+		public static void Require(bool assertion, string message)
+		{
+			if (UseExceptions) 
+			{
+				if (!assertion)	
+					throw new PreconditionException(message);
+			}
+			else
+			{
+				Trace.Assert(assertion, "Precondition: " + message);
+			}
+		}
+
+		/// <summary>
+		/// Precondition check.
+		/// </summary>
+		[Conditional("DBC_CHECK_ALL"), 
+		Conditional("DBC_CHECK_INVARIANT"), 
+		Conditional("DBC_CHECK_POSTCONDITION"), 
+		Conditional("DBC_CHECK_PRECONDITION")]
+		public static void Require(bool assertion, string message, Exception inner)
+		{
+			if (UseExceptions) 
+			{
+				if (!assertion)	
+					throw new PreconditionException(message, inner);
+			}
+			else
+			{
+				Trace.Assert(assertion, "Precondition: " + message);
+			}
+		}
+
+		/// <summary>
+		/// Precondition check.
+		/// </summary>
+		[Conditional("DBC_CHECK_ALL"),
+		Conditional("DBC_CHECK_INVARIANT"), 
+		Conditional("DBC_CHECK_POSTCONDITION"), 
+		Conditional("DBC_CHECK_PRECONDITION")]
+		public static void Require(bool assertion)
+		{
+			if (UseExceptions) 
+			{
+				if (!assertion)
+					throw new PreconditionException("Precondition failed.");
+			}
+			else
+			{
+				Trace.Assert(assertion, "Precondition failed.");
+			}
+		}
+		
+		/// <summary>
+		/// Postcondition check.
+		/// </summary>
+		[Conditional("DBC_CHECK_ALL"),
+		Conditional("DBC_CHECK_INVARIANT"), 
+		Conditional("DBC_CHECK_POSTCONDITION")] 
+		public static void Ensure(bool assertion, string message)
+		{
+			if (UseExceptions) 
+			{
+				if (!assertion)	
+					throw new PostconditionException(message);
+			}
+			else
+			{
+				Trace.Assert(assertion, "Postcondition: " + message);
+			}
+		}
+
+		/// <summary>
+		/// Postcondition check.
+		/// </summary>
+		[Conditional("DBC_CHECK_ALL"),
+		Conditional("DBC_CHECK_INVARIANT"), 
+		Conditional("DBC_CHECK_POSTCONDITION")] 
+		public static void Ensure(bool assertion, string message, Exception inner)
+		{
+			if (UseExceptions) 
+			{
+				if (!assertion)	
+					throw new PostconditionException(message, inner);
+			}
+			else
+			{
+				Trace.Assert(assertion, "Postcondition: " + message);
+			}
+		}
+
+		/// <summary>
+		/// Postcondition check.
+		/// </summary>
+		[Conditional("DBC_CHECK_ALL"),
+		Conditional("DBC_CHECK_INVARIANT"), 
+		Conditional("DBC_CHECK_POSTCONDITION")] 
+		public static void Ensure(bool assertion)
+		{
+			if (UseExceptions) 
+			{
+				if (!assertion)	
+					throw new PostconditionException("Postcondition failed.");
+			}
+			else
+			{
+				Trace.Assert(assertion, "Postcondition failed.");
+			}
+		}
+		
+		/// <summary>
+		/// Invariant check.
+		/// </summary>
+		[Conditional("DBC_CHECK_ALL"),
+		Conditional("DBC_CHECK_INVARIANT")] 
+		public static void Invariant(bool assertion, string message)
+		{
+			if (UseExceptions) 
+			{
+				if (!assertion)	
+					throw new InvariantException(message);
+			}
+			else
+			{
+				Trace.Assert(assertion, "Invariant: " + message);
+			}
+		}
+
+		/// <summary>
+		/// Invariant check.
+		/// </summary>
+		[Conditional("DBC_CHECK_ALL"),
+		Conditional("DBC_CHECK_INVARIANT")] 
+		public static void Invariant(bool assertion, string message, Exception inner)
+		{
+			if (UseExceptions) 
+			{
+				if (!assertion)	
+					throw new InvariantException(message, inner);
+			}
+			else
+			{
+				Trace.Assert(assertion, "Invariant: " + message);
+			}
+		}
+
+		/// <summary>
+		/// Invariant check.
+		/// </summary>
+		[Conditional("DBC_CHECK_ALL"),
+		Conditional("DBC_CHECK_INVARIANT")] 
+		public static void Invariant(bool assertion)
+		{
+			if (UseExceptions) 
+			{
+				if (!assertion)	
+					throw new InvariantException("Invariant failed.");
+			}
+			else
+			{
+				Trace.Assert(assertion, "Invariant failed.");
+			}
+		}
+
+		/// <summary>
+		/// Assertion check.
+		/// </summary>
+		[Conditional("DBC_CHECK_ALL")]
+		public static void Assert(bool assertion, string message)
+		{
+			if (UseExceptions) 
+			{
+				if (!assertion)	
+					throw new AssertionException(message);
+			}
+			else
+			{
+				Trace.Assert(assertion, "Assertion: " + message);
+			}
+		}
+
+		/// <summary>
+		/// Assertion check.
+		/// </summary>
+		[Conditional("DBC_CHECK_ALL")] 
+		public static void Assert(bool assertion, string message, Exception inner)
+		{
+			if (UseExceptions) 
+			{
+				if (!assertion)	
+					throw new AssertionException(message, inner);
+			}
+			else
+			{
+				Trace.Assert(assertion, "Assertion: " + message);
+			}
+		}
+
+		/// <summary>
+		/// Assertion check.
+		/// </summary>
+		[Conditional("DBC_CHECK_ALL")]
+		public static void Assert(bool assertion)
+		{
+			if (UseExceptions) 
+			{
+				if (!assertion)
+					throw new AssertionException("Assertion failed.");
+			}
+			else
+			{
+				Trace.Assert(assertion, "Assertion failed.");
+			}
+		}
+
+		/// <summary>
+		/// Set this if you wish to use Trace Assert statements 
+		/// instead of exception handling. 
+		/// (The Check class uses exception handling by default.)
+		/// </summary>
+		public static bool UseAssertions
+		{
+			get
+			{
+				return useAssertions;
+			}
+			set
+			{
+				useAssertions = value;
+			}
+		}
+		
+		#endregion // Interface
+
+		#region Implementation
+
+		// No creation
+		private Check() {}
+
+		/// <summary>
+		/// Is exception handling being used?
+		/// </summary>
+		private static bool UseExceptions
+		{
+			get
+			{
+				return !useAssertions;
+			}
+		}
+
+		// Are trace assertion statements being used? 
+		// Default is to use exception handling.
+		private static bool useAssertions = false;
+
+		#endregion // Implementation
+
+		#region Obsolete
+
+		/// <summary>
+		/// Precondition check.
+		/// </summary>
+		[Obsolete("Set Check.UseAssertions = true and then call Check.Require")]
+		[Conditional("DBC_CHECK_ALL"), 
+		Conditional("DBC_CHECK_INVARIANT"), 
+		Conditional("DBC_CHECK_POSTCONDITION"), 
+		Conditional("DBC_CHECK_PRECONDITION")]
+		public static void RequireTrace(bool assertion, string message)
+		{
+			Trace.Assert(assertion, "Precondition: " + message);
+		}
+
+
+		/// <summary>
+		/// Precondition check.
+		/// </summary>
+		[Obsolete("Set Check.UseAssertions = true and then call Check.Require")]
+		[Conditional("DBC_CHECK_ALL"),
+		Conditional("DBC_CHECK_INVARIANT"), 
+		Conditional("DBC_CHECK_POSTCONDITION"), 
+		Conditional("DBC_CHECK_PRECONDITION")]
+		public static void RequireTrace(bool assertion)
+		{
+			Trace.Assert(assertion, "Precondition failed.");
+		}
+		
+		/// <summary>
+		/// Postcondition check.
+		/// </summary>
+		[Obsolete("Set Check.UseAssertions = true and then call Check.Ensure")]
+		[Conditional("DBC_CHECK_ALL"),
+		Conditional("DBC_CHECK_INVARIANT"), 
+		Conditional("DBC_CHECK_POSTCONDITION")] 
+		public static void EnsureTrace(bool assertion, string message)
+		{
+			Trace.Assert(assertion, "Postcondition: " + message);
+		}
+
+		/// <summary>
+		/// Postcondition check.
+		/// </summary>
+		[Obsolete("Set Check.UseAssertions = true and then call Check.Ensure")]
+		[Conditional("DBC_CHECK_ALL"),
+		Conditional("DBC_CHECK_INVARIANT"), 
+		Conditional("DBC_CHECK_POSTCONDITION")] 
+		public static void EnsureTrace(bool assertion)
+		{
+			Trace.Assert(assertion, "Postcondition failed.");
+		}
+		
+		/// <summary>
+		/// Invariant check.
+		/// </summary>
+		[Obsolete("Set Check.UseAssertions = true and then call Check.Invariant")]
+		[Conditional("DBC_CHECK_ALL"),
+		Conditional("DBC_CHECK_INVARIANT")] 
+		public static void InvariantTrace(bool assertion, string message)
+		{
+			Trace.Assert(assertion, "Invariant: " + message);
+		}
+
+		/// <summary>
+		/// Invariant check.
+		/// </summary>
+		[Obsolete("Set Check.UseAssertions = true and then call Check.Invariant")]
+		[Conditional("DBC_CHECK_ALL"),
+		Conditional("DBC_CHECK_INVARIANT")] 
+		public static void InvariantTrace(bool assertion)
+		{
+			Trace.Assert(assertion, "Invariant failed.");
+		}
+
+		/// <summary>
+		/// Assertion check.
+		/// </summary>
+		[Obsolete("Set Check.UseAssertions = true and then call Check.Assert")]
+		[Conditional("DBC_CHECK_ALL")]
+		public static void AssertTrace(bool assertion, string message)
+		{
+			Trace.Assert(assertion, "Assertion: " + message);
+		}
+
+		/// <summary>
+		/// Assertion check.
+		/// </summary>
+		[Obsolete("Set Check.UseAssertions = true and then call Check.Assert")]
+		[Conditional("DBC_CHECK_ALL")]
+		public static void AssertTrace(bool assertion)
+		{
+			Trace.Assert(assertion, "Assertion failed.");
+		}
+		#endregion // Obsolete
+
+	} // End Check
+
+	#region Exceptions
+
+	/// <summary>
+	/// Exception raised when a contract is broken.
+	/// Catch this exception type if you wish to differentiate between 
+	/// any DesignByContract exception and other runtime exceptions.
+	///  
+	/// </summary>
+	public class DesignByContractException : ApplicationException
+	{
+		protected DesignByContractException() {}
+		protected DesignByContractException(string message) : base(message) {}
+		protected DesignByContractException(string message, Exception inner) : base(message, inner) {}
+	}
+
+	/// <summary>
+	/// Exception raised when a precondition fails.
+	/// </summary>
+	public class PreconditionException : DesignByContractException
+	{
+		/// <summary>
+		/// Precondition Exception.
+		/// </summary>
+		public PreconditionException() {}
+		/// <summary>
+		/// Precondition Exception.
+		/// </summary>
+		public PreconditionException(string message) : base(message) {}
+		/// <summary>
+		/// Precondition Exception.
+		/// </summary>
+		public PreconditionException(string message, Exception inner) : base(message, inner) {}
+	}
+	
+	/// <summary>
+	/// Exception raised when a postcondition fails.
+	/// </summary>
+	public class PostconditionException : DesignByContractException
+	{
+		/// <summary>
+		/// Postcondition Exception.
+		/// </summary>
+		public PostconditionException() {}
+		/// <summary>
+		/// Postcondition Exception.
+		/// </summary>
+		public PostconditionException(string message) : base(message) {}
+		/// <summary>
+		/// Postcondition Exception.
+		/// </summary>
+		public PostconditionException(string message, Exception inner) : base(message, inner) {}
+	}
+
+	/// <summary>
+	/// Exception raised when an invariant fails.
+	/// </summary>
+	public class InvariantException : DesignByContractException
+	{
+		/// <summary>
+		/// Invariant Exception.
+		/// </summary>
+		public InvariantException() {}
+		/// <summary>
+		/// Invariant Exception.
+		/// </summary>
+		public InvariantException(string message) : base(message) {}
+		/// <summary>
+		/// Invariant Exception.
+		/// </summary>
+		public InvariantException(string message, Exception inner) : base(message, inner) {}
+	}
+
+	/// <summary>
+	/// Exception raised when an assertion fails.
+	/// </summary>
+	public class AssertionException : DesignByContractException
+	{
+		/// <summary>
+		/// Assertion Exception.
+		/// </summary>
+		public AssertionException() {}
+		/// <summary>
+		/// Assertion Exception.
+		/// </summary>
+		public AssertionException(string message) : base(message) {}
+		/// <summary>
+		/// Assertion Exception.
+		/// </summary>
+		public AssertionException(string message, Exception inner) : base(message, inner) {}
+	}
+
+	#endregion // Exception classes
+
+} // End Design By Contract
diff --git a/Utilities/DesignByContract.cs.meta b/Utilities/DesignByContract.cs.meta
new file mode 100644
index 0000000..729468b
--- /dev/null
+++ b/Utilities/DesignByContract.cs.meta
@@ -0,0 +1,10 @@
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+guid: 5a6942e14a8d33d46a05b33d50392652
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 
diff --git a/Utilities/Dispatcher.cs b/Utilities/Dispatcher.cs
new file mode 100644
index 0000000..137ebdc
--- /dev/null
+++ b/Utilities/Dispatcher.cs
@@ -0,0 +1,20 @@
+public class Dispatcher<S, T>
+{
+    public event System.Action<S, T> observers;
+
+    private Dispatcher() { }
+
+    public Dispatcher(S sender)
+    {
+        _sender = sender;
+    }
+
+    virtual public void Dispatch(T value)
+    {
+        if (observers != null)
+            observers(_sender, value);
+    }
+
+    S  _sender;
+}
+
diff --git a/Utilities/Dispatcher.cs.meta b/Utilities/Dispatcher.cs.meta
new file mode 100644
index 0000000..8e801c6
--- /dev/null
+++ b/Utilities/Dispatcher.cs.meta
@@ -0,0 +1,12 @@
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+guid: d8886d5d5f5929c479998a1316264c23
+timeCreated: 1436121137
+licenseType: Free
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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
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diff --git a/Utilities/DispatcherOnChange.cs b/Utilities/DispatcherOnChange.cs
new file mode 100644
index 0000000..19599f8
--- /dev/null
+++ b/Utilities/DispatcherOnChange.cs
@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+
+public class DispatcherOnChange<S, T>: Dispatcher<S, T>
+{
+    public DispatcherOnChange(S sender) : base(sender) { }
+
+    public T value
+    {
+        set
+        {
+            if (EqualityComparer<T>.Default.Equals(value, _value) == false)
+            {
+                _value = value;
+
+                Dispatch(value);
+            }
+        }
+    }
+
+    T _value;
+}
+
diff --git a/Utilities/DispatcherOnChange.cs.meta b/Utilities/DispatcherOnChange.cs.meta
new file mode 100644
index 0000000..54c805e
--- /dev/null
+++ b/Utilities/DispatcherOnChange.cs.meta
@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: 103dfa72bd2486d46ac7e6927c805778
+timeCreated: 1435956509
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diff --git a/Utilities/WeakReference.cs b/Utilities/WeakReference.cs
new file mode 100644
index 0000000..5dae223
--- /dev/null
+++ b/Utilities/WeakReference.cs
@@ -0,0 +1,50 @@
+using System;
+using System.Runtime.Serialization;
+/// <span class="code-SummaryComment"><summary></span>
+/// Represents a weak reference, which references an object while still allowing
+/// that object to be reclaimed by garbage collection.
+/// <span class="code-SummaryComment"></summary></span>
+/// <span class="code-SummaryComment"><typeparam name="T">The type of the object that is referenced.</typeparam></span>
+[Serializable]
+public class WeakReference<T>
+    : WeakReference where T : class
+{
+    /// <span class="code-SummaryComment"><summary></span>
+    /// Initializes a new instance of the WeakReference{T} class, referencing
+    /// the specified object.
+    /// <span class="code-SummaryComment"></summary></span>
+    /// <span class="code-SummaryComment"><param name="target">The object to reference.</param></span>
+    public WeakReference(T target)
+        : base(target)
+    { }
+    /// <span class="code-SummaryComment"><summary></span>
+    /// Initializes a new instance of the WeakReference{T} class, referencing
+    /// the specified object and using the specified resurrection tracking.
+    /// <span class="code-SummaryComment"></summary></span>
+    /// <span class="code-SummaryComment"><param name="target">An object to track.</param></span>
+    /// <span class="code-SummaryComment"><param name="trackResurrection">Indicates when to stop tracking the object. </span>
+    /// If true, the object is tracked
+    /// after finalization; if false, the object is only tracked 
+    /// until finalization.<span class="code-SummaryComment"></param></span>
+    public WeakReference(T target, bool trackResurrection)
+        : base(target, trackResurrection)
+    { }
+    protected WeakReference(SerializationInfo info, StreamingContext context)
+        : base(info, context)
+    { }
+    /// <span class="code-SummaryComment"><summary></span>
+    /// Gets or sets the object (the target) referenced by the 
+    /// current WeakReference{T} object.
+    /// <span class="code-SummaryComment"></summary></span>
+    public new T Target
+    {
+        get
+        {
+            return (T)base.Target;
+        }
+        set
+        {
+            base.Target = value;
+        }
+    }
+}
diff --git a/Utilities/WeakReference.cs.meta b/Utilities/WeakReference.cs.meta
new file mode 100644
index 0000000..951b563
--- /dev/null
+++ b/Utilities/WeakReference.cs.meta
@@ -0,0 +1,12 @@
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+guid: 2bf8d1cb161e6aa428300dba9323892e
+timeCreated: 1434750269
+licenseType: Free
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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
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