Add create merge checkbox.

Open Jacob Schatz requested to merge new-mr-repo-editor into master

What does this MR do?

Adds a checkbox to start a new MR from a branch. Merge https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14586 first. This relies upon it.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

https://gitlab.com/gitlab-org/gitlab-ce/issues/38626

Screenshots (if relevant)

Screen_Shot_2017-10-03_at_3.17.57_PM

cooooldude

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Fixes #38626

Edited by username-removed-892863