New rules for protected branches

This MR change permissions logic for branch removal. Changes listed below:

Before
* developer can remove branch with terminal but not in UI
* masters can remove any branch with UI even protected one
* force-push to protected branch is not allowed but remove is allowed

After
* none can force push or remove protected branches
* developers and masters can remove normal branches with console and UI

Fix js error when use scroll to highlighted line

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fix avatar URLs in JS-lists for relative_url_root

Update message on the group dashboard page

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Improved edit file ui

* remove ugly borders
* replace small buttons with tabs
* add spinner while diff is loading

Ability to upload avatar when create new group

Before this change you dont know you can upload avatar for group until you visit group edit page.

After this change you are able to upload avatar during group creation

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Grammar fixes

fixed typos in groups messages

Dev setup on metal

Cloud com

Deploy key in multiple projects

Add doc on adding a deploy key easily to multiple projects through the API.

Small ui improvements

* fix ugly errors block when admin save invalid user
* fix ugly errors when you tries to save invalid wiki page

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Improve Milestome UI

Milestone UI header was different from Issue/MR pages but use same UI elements.
This MR fixes it so UI looks same for issue/mr/milestone

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

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fix install guide

Fix gitlab setup. DB setup must go after gitlab-shell setup. Because in seeds we need `/home/git/repositories` to exist

Rebuild Postgres indexes after a MySQL conversion