Use project dependencies instead of references (works around bugs in SHFB)
Updated package references to the VSSDK 1.0.3 release
Update the Commenter.Interfaces assembly to work with multiple versions of the underlying VSSDK dependencies
Updated NuGet package specifications according to the recommended practices in VSSDK 1.0.3
Merge pull request #35 from sharwell/vsxdeps

Updated VSSDK dependencies