Added ObjectExtensionsTests, Added functionality for MVC to render any macro types (i.e. razor and xslt, etc..)

Adds UmbracoHelper as a property to the RenderViewPage for MVC. Tested rendering Xslt and Razor macros with and
without parameters and works well.
Next we need to get the RTE rendering with macros embedded in MVC.

src/Umbraco.Tests/StringExtensionsTests.cs

@@ -1,11 +1,14 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
+using System.Security;
 using System.Text;
+using System.Web.Mvc;
 using NUnit.Framework;
 using Umbraco.Core;
 
 namespace Umbraco.Tests
 {
-    [TestFixture]
+	[TestFixture]
     public class StringExtensionsTests
     {
         [TestCase("Hello this is my string", " string", "Hello this is my")]