Updated unit tests for the module to inherit from proper base classes.

Updated default.aspx to support more backwards compatible features that had been removed, there
was a lot of breaking changes there!

src/Umbraco.Tests/TestHelpers/BaseWebTest.cs

@@ -27,6 +27,8 @@ namespace Umbraco.Tests.TestHelpers
 		[TearDown]
 		public virtual void TearDown()
 		{
+			//reset the app context
+			ApplicationContext.Current = null;
 			//reset the context on global settings
 			Umbraco.Core.Configuration.GlobalSettings.HttpContext = null;
 			Resolution.IsFrozen = false;