Solution would not build in VS 2013 because of NuGet configuration error.

Encountered the following compile error on both project: 

`The task factory "CodeTaskFactory" could not be loaded from the assembly "C:\Program Files (x86)\MSBuild\12.0\bin\Microsoft.Build.Tasks.v4.0.dll". Could not load file or assembly 'file:///C:\Program Files (x86)\MSBuild\12.0\bin\Microsoft.Build.Tasks.v4.0.dll' or one of its dependencies. The system cannot find the file specified.`

NuGet target was using the correct tools path but the wrong Tasks dll name. See [this SO question](http://stackoverflow.com/questions/20661943/build-on-tfs-2013-failed-but-okay-locally).