Mercurial

Will, I suggest you learn Mercurial now.  This would make it easier to work together and is very useful as a record of changes.  I use command line only because the GUI tools are modern crap.

https://www.mercurial-scm.org/
https://bitbucket.org/

I'm close to finishing the front end. So I'll finish the front end, by tomorrow, then I'll learn Mercurial.