Add ability to use email in Gitlab authentication
Review Request #5591 — Created March 8, 2014 and submitted — Latest diff uploaded
Older versions of Gitlab API v3 only allow authentication using email instead of "login" parameter that Review board currently uses.
See https://github.com/gitlabhq/gitlabhq/commit/559e83d30004e0c41a30f4ce3463f695eb7e26a1
Unit tests pass. Tested authentication with email againts different versions of Gitlab.