Add option to mirror an upstream repository.
Closes internal https://dev.gitlab.org/gitlab/gitlab-ee/issues/279
Depends on gitlab-org/gitlab-shell!29
To do:
- [x] Decide on what user should be the author of the activity feed events. The initial project creator perhaps? That makes sense for personal projects, but less so for group projects, where it's even possible that the creator has since left the team.
- [x] Write specs!
- [x] Write documentation
- [x] Port back relevant commits to CE: gitlab-org/gitlab-ce!1822
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## Mirror status on project homepage

## Settings navigation item

## Mirroring settings

## Activity feed with new "pushes" (mirror updates)

I have yet to decide on what user should be the author of these events. The initial project creator perhaps? That makes sense for personal projects, but less so for group projects, where it's even possible that the creator has since left the team.
## Warning that branch has diverged from upstream

## Commits heading after failed update

Link send user to the mirroring settings if they are a project admin.
## Mirroring settings after failed update

## New project page

## Import form after failed import
(Screenshot outdated)

Shown when the initial import of a project fails, not when an update of an existing project fails.
cc @dzaporozhets @sytses @JobV
See merge request !51
To prevent leaking of users info we reduce amount of user information
retrieved via API for normal users.
What user can get via API:
* if not admin: only id, state, name, username and avatar_url
* if admin: all user information
* about himself: all informaion
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
In user lists created when entering a (partial) user name into
a field, the URL to the user avatar was invalid if running with
relative_url_root.
This patch is the result of:
sed -i 's/\(= *\)\(user\.avatar_url\)/\1gon.relative_url_root + \2/' \
app/assets/javascripts/*.coffee