Remove Package Restore The Wrong Way™

Package Restore is built in to Visual Studio and NuGet. No need for this
MsBuild targets crap.

http://blog.davidebbo.com/2014/01/the-right-way-to-restore-nuget-packages.html
Add nuget.exe back for release script
Merge pull request #121 from akavache/haacked/nuget-restore-the-right-way

Remove Package Restore The Wrong Way™