Fix 500 Error When Creating Issue For Project With No Commits

This merge request fixes issue #153, where trying to create an issue for a project with no commits results in a 500 error. This was done by updating the form to check that the repository wasn't empty before trying to load the contribution guide.

The form was updated to check that the repository wasn't empty before trying
to load the contribution guide.

This fixes #153.

Refactor Parallel Diff feature and add scrollbars

gitlab:ldap:check uses LDAP user filter

Also now removed lines relating to unused comments feature

Check Css

Based on Dmitriy his remark https://gitlab.slack.com/archives/general/p1395770459000142

Case insensitive user search

As per implementation by Christopher Arnold.

Rename Diff to Changes

Removed the backgrounding of the unicorn_rails startup scripts

Fix Unicorn-Sidekiq Confusion In GitLab Init Script

This merge request fixes issue #126 by updating a few sections of the included GitLab init file where Unicorn was referred to as Sidekiq and vice-versa.

Init script - change stop() function name to stop_gitlab()

Change the notification sender username to GitLab in Slack Notifier

Gzip compression for assets in changelog

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>

Use monospace fonts for GFM inputs

This is an MR for [this feedback suggestion](http://feedback.gitlab.com/forums/176466-general/suggestions/5593468-use-monospace-font-in-wiki-edit-content-textarea).

I'm not sure exactly where the best place for the fix is, but I opted for the typography.scss file.  Basically, all ``textarea.js-gfm-input`` elements are styled with ``font-family: $monospace_font;``.

*PS: this being my first MR to gitlab, I apologize if I missed any steps in the process; let me know what's missing and I'll correct it here & in future MRs*

Add method to get the comments on a merge request

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

Allow at mentions for people who are not members of the project

EventCreateService class

The goal is to collect all event creation logic in one place called EventCreateService.
Because now its placed in observers, controllers, services etc

Remove author_id_of_changes

To prevent confusion because we already have `current_user`

Define Feature Request in Process doc

Conflicts:
	PROCESS.md

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