Improve for large groupsImprove for large groups

This merge request is a set of patched to improve application for large groups with more then 100 people.

Pages to be improved:
✅ Group#members page
✅ Project#issues page
✅ Project#merge_requests page
✅ Project#new_issue page
✅ Project#new_mr page
✅ Project#members page

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

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

Add email aliases for users
Email aliases are used to associate commits with users. The emails are not verified and don't have to be valid email addresses. They are assigned on a first come, first serve basis.
This addresses http://feedback.gitlab.com/forums/176466-general/suggestions/3692666-ability-to-have-multiple-email-address.

Emails are used to associate commits with users. The emails
are not verified and don't have to be valid email addresses. They
are assigned on a first come, first serve basis.

Notifications are sent when an email is added.

Fixes #6311: cp the init.d file locally instead of remote

Added gitter link

Remove Backtics In Anchor Text

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>

Add documentation for MR workflow

Add emoji images to asset load path.

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>

User can leave group from group page.

Markdown Styles

Remove Gem Button

Refactor Compare logic

Updated gitlab_git to version 5.4.0.
Fixes MR diff download link in case of huge diff.
Fixes #1026

Markup Dependencies

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>

Fix spelling of "GitLab" in HipChat service

add rake gitlab:import: all_users_to_all_groups and user_to_groups

Pedantic, but it frustrates OCD people like myself :)