So with Visual Studio 2015 just being released there is a much more integrated tie-in with git.
However the feature that seems to be lacking is git over SSH. There
It is possible to enable ssh support by recompiling the GIT library distributed with Visual Studio 2015. The following article describes the required steps:
http://randomswdev.blogspot.it/2015/07/adding-ssh-support-to-visual-studio.html