Update libgit2 binaries to eef7e80
https://github.com/libgit2/libgit2/compare/40a6051...eef7e80
Make Diff.Compare consider untracked changes
Use reference counting in SafeHandleBase to ensure git_threads_shutdown() only gets called after the last handle is released (joint work with Sam Harwell)
Update libgit2 binaries to ad00376

https://github.com/libgit2/libgit2/compare/eef7e80...ad00376
Clean-up trailing whitespaces

For the psychopath that lies deep down in each one of us.
Move Stage()/Unstage() tests to their own files
Update libgit2 binaries to 6950dca

https://github.com/libgit2/libgit2/compare/ad00376...6950dca
Teach BranchUpdater to set merge branch directly