Show a short MR URL on creating or updating a merge request.

The new URL is:

host/mr/:id

and will just redirect to the full URL (if the user have the permissons):

host/projects/:project_id/merge_requests/:id
Don't show "Add comment" button on closed MRs.
Work (in theory) with safary flex implementation.
Add copyright footer.
Change reviewit MR commit stamp and avoid sending commit stamp inside commit messages on MR update.
Throw error when trying to push a closed MR.
Fix use of flex layout.
Save reviewer of a patch.
Show simple list of users in the project.
Add name in the sign-up form.