This is quick and dirty way of fixing the problem. It doesn't migrate
the notes from the previous repo and just discards them, so you cannot
move your notes from one repo to another using GitJournal (for now), but
at least its better than having to re-install the app.
Related to #36
For now the only 2 options are - automaitic and manual.
I rather name it "Automatic" instead of "After each change" as that way
I can choose to do it more frequently, if desired.
Fixes#8
This way you can regenerate the SSH Key (if needed) and/or copy it
again. In the future one can add methods to reconfigure the git remote
and add / remove remotes.
