Bring back color in Git graph

[jelaniwoods]

instead of

* 9eb2cfa (HEAD -> heroku-test) test
| * 8a12d2e (refs/stash) On heroku-test: Temporary Stash 3
|/| 
| * c099f3c index on heroku-test: e84c199 Starting point
|/  
* e84c199 (origin/master, origin/HEAD, master) Starting point