Jenkins: improved parser

Original issue - https://dev.gitlab.org/gitlab/gitlabhq/issues/1582

There were two problems:
1. Jenkins has changed html a bit
2. All the attributes of image indicator will be translated if locale is changed. So I had to parse path to image.

Now Jenkins service parses correctly both new and old status page. Also it does not matter what locale is set. Basically Jenkins look at the "Accept-Language" header from your browser for locale determining. So we could not take localisation into account at all. But there are ways to change this behaviour and just for sure I decided to implement localisation-independent way.

See merge request !234

Fix broken migration

See merge request !233

Omnibus Ci packages

See merge request !231

Update changelog

See merge request !232

Git hook api

Fixes #176

Fixes #169

See merge request !229

Ability to block commits with certain filenames

Implementing of this issue https://dev.gitlab.org/gitlab/gitlabhq/issues/1574

![prohibited file names](https://dl.dropboxusercontent.com/u/936096/prohibited.png)

See merge request !230

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

Conflicts:
	CHANGELOG-EE

Git hooks for email checking

https://dev.gitlab.org/gitlab/gitlab-ee/issues/165

https://dev.gitlab.org/gitlab/gitlab-ee/issues/167

See merge request !228

Newpkgs

/cc @jacobvosmaer @dzaporozhets

See merge request !227

743 pkgs

/cc @valery

See merge request !226

7-4-stable-ee to master. With resolved conflicts

See merge request !222

Conflicts:
	VERSION

Add 7.4.2-ee packages

See merge request !220