-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/Serialization/SerializationEventAttributeTests.cs

@@ -27,12 +27,9 @@
 using System;
 using System.Diagnostics;
 using System.IO;
-using System.Linq;
 using System.Reflection;
 using System.Runtime.Serialization;
-using System.Text;
 using Newtonsoft.Json.Serialization;
-using Newtonsoft.Json.Tests;
 using Newtonsoft.Json.Tests.TestObjects;
 #if !NETFX_CORE
 using NUnit.Framework;
@@ -42,8 +39,6 @@ using TestFixture = Microsoft.VisualStudio.TestTools.UnitTesting.TestClassAttrib
 using Test = Microsoft.VisualStudio.TestTools.UnitTesting.TestMethodAttribute;
 #endif
 using Newtonsoft.Json.Linq;
-using Newtonsoft.Json.Converters;
-using Newtonsoft.Json.Utilities;
 
 namespace Newtonsoft.Json.Tests.Serialization
 {