Remove inclusion of repositories.config

If you use package restore, you actually don't want this file
included. It's not needed. It's only needed if you version
packages. AKA, you only need this file if you are not ignoring
the "packages" folder.
Update Global/VisualStudio.gitignore

Visual Studio 2010 Express for Windows Phone seems to generate .cachefile files.
Merge pull request #518 from Haacked/more-pr-consolidation

More pr consolidation