Add build task that renames the System.Web.Razor assemblyname to System.Web.Razor.Unofficial. nuspec modified accordingly. Version is 2.0.2

Signed-off-by: Damian Hickey <dhickey@gmail.com>
Force v4.0 TargetFrameworkVersion
Merge pull request #1 from damianh/SystemWebRazorAssemblyRename

Renames the System.Web.Razor assembly to System.Web.Razor.Unofficial.dll