Rename projects according to target Visual Studio version
Add Commenter Interfaces projects for Visual Studio 2012 and 2013
Add Shell Services projects for Visual Studio 2012 and 2013
Add Shell Utility projects for Visual Studio 2012 and 2013
Add Text Editor Utility projects for Visual Studio 2012 and 2013
Clarify declaration of non-exposed NuGet dependency
Update documentation to mention version-specific NuGet packages
Fix declared dependencies in NuGet package specifications for extension packages
Merge pull request #28 from sharwell/project-versions

Project versions