Faster branch contains detection for commit

Much faster then iterate over all branches in rugged and look for existing commit

See merge request !1129

Add predictable merge requests on dev seed.

Prevent email sending on admin dev seed.

Only show text wrap and diff notes for text in merge requests.

Add web UI file CRUD tests.

Improve gitflow article

See merge request !195

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

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

Gitlab flow

This article describes the best practices we use at GitLab B.V.
This is still a draft, please comment and submit improvements.

See merge request !176

Conflicts:
	CONTRIBUTING.md

Faster rev list

Since rugged does not support path filtering yet it affects GitLab performance.
So we use `git rev-list` as temporary but fast and reliable solution for looking last commit of tree

Fixes #1622

See merge request !1127

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

Omnibus words

As discussed:

We want to standarize the words 'omnibus package' to avoid (apparent) confusion regarding the installation and setup methods.

See merge request !1126

Issue box redesign

I complained before about the issue box looks. This is a proposed redesign.

The background of the issue is slightly lighter than the comments, so there is a clear distinction.

To make sure the issue then doesn't disappear, the shadow is slightly strongly (but still barely noticeable, to keep it flat).

The left top corner is round to highlight the status 'label', as it were a real label.

See merge request !1125

Improving graphs: add new commits graphs page

This MR adds new page to graphs sections with commits statistic

![Screenshot 2014-09-26 20.32.01](https://dev.gitlab.org/uploads/dzaporozhets/gitlabhq/61fd84c4d6/Screenshot_2014-09-26_20.32.01.png)

See merge request !1124

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

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

Remove type submit from button_tag since default.

Replace empty? || nil? with blank?.

Typo indiciated -> indicated.

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

Refactor graphs

This is first step of refactoring graphs. It includes removing all outdated and non-working stuff.

Related to #1590

See merge request !1123

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

* remove commits stats page (will be replaced by graphs)
* remove additions/deletions from graph because of bad performance
* keep graph logic in gitlab
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>