-Added IgnoreSerializableInterface to DefaultContractResolver

-Changed serializing ISerializable types under partial trust to error to fix security issue
-Fixed LinqBridge collision error in .NET 2.0 by moving types to a different namespace
-Fixed JObject.Keys error when object has no items

Src/Newtonsoft.Json.Tests/Converters/JavaScriptDateTimeConverterTests.cs

@@ -24,10 +24,6 @@
 #endregion
 
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using Newtonsoft.Json.Tests.TestObjects;
 #if !NETFX_CORE
 using NUnit.Framework;
 #else
@@ -36,6 +32,7 @@ using TestFixture = Microsoft.VisualStudio.TestTools.UnitTesting.TestClassAttrib
 using Test = Microsoft.VisualStudio.TestTools.UnitTesting.TestMethodAttribute;
 #endif
 using Newtonsoft.Json.Converters;
+using Newtonsoft.Json.Tests.TestObjects;
 
 namespace Newtonsoft.Json.Tests.Converters
 {