Files Leftover After Switching Back To Nuget Packages

[SmeeK153]

After changing back to using nuget packages from projects, there are two files being left in the directory that are no longer needed:

• *.nugetreferenceswitcher
• *.previous.nugetreferenceswitcher

This is also causing a tag to be removed from the csproj file and a to be added, and this is not reversed when switching back to nuget packages from projects.

Would it be possible to internally create a git "feature" branch on the solution being edited when using this utility so that when project references are switched back to nuget packages then everything can be rolled back?

I would be willing to work in this change myself.

[SmeeK153]

Added pull request to integrate these changes:
#42