Fixed BuildErrors when project is completly downloaded from GitHub.

Project can only be build, wehen NuGet.exe > 2.8.1 is included in .nuget
folder.
Missing dll Telerik.Web.Mvc added to lib Folder.
Telerik.Web.Mvc removed from build Folder (build folder will be created
with ClickToBuild-Command)
References to Telerik.Web.Mvc fixed in two Plugin-Projects.
Merge pull request #499 from ivanrusso/2.x

Some BugFixes -> Ensure build without errors