Update Contributing Guide with new branch flow. (#2983)
...
* Update Contributing Guide with new branch flow.
Added more details, links to GitHub docs about forking, and the new
branching flow. As a bonus, also changed some minor things in the
editorconfig.
* Fix typo.
* a couple more minor details
Chad Engler
authored
on 21 Sep 2016
Mat Groves
committed
on 21 Sep 2016