Add branch references to GFM
During !7216 (merged) we started to discuss on how we reference branch in general and in slash commands specifically.
Start's here: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7216#note_22392687
Character ^ is proposed to be branch character, I chose it because it reminds "fork(crossroads)" which effectively branch is.
Please, share your thoughts.