Add comments around code to make it easier to understand, move remove_branch code into a separate method.

Better message for failed pushes because of git hooks

https://dev.gitlab.org/gitlab/gitlab-ee/issues/119

See merge request !242

Audit event documentation

See merge request !251

Audit feature / permission changes in log

Audit events for membership changes of the group and project.

See merge request !250

Fix Enterprise Project Settings Icons

Font awesome was upgraded in CE and the corresponding enterprise project settings icons 'Groups' and 'Git Hooks' were not displaying any icon. The groups icon is exactly as it was pre-7.5. The git hooks icon is much different in the new font-awesome and did not make sense anymore. They do have a generic 'git' icon which I have included here and think looks nice.

## Pre-7.5:
![Screen Shot 2014-11-21 at 5.14.07 PM](https://gitlab.com/uploads/subscribers/gitlab-ee/12c3034fef/Screen_Shot_2014-11-21_at_5.14.07_PM.png)

## 7.5:
![Screen Shot 2014-11-21 at 5.14.24 PM](https://gitlab.com/uploads/subscribers/gitlab-ee/4f97728c19/Screen_Shot_2014-11-21_at_5.14.24_PM.png)

## After this merge request:
![Screen Shot 2014-11-21 at 5.14.17 PM](https://gitlab.com/uploads/subscribers/gitlab-ee/09b06bfddc/Screen_Shot_2014-11-21_at_5.14.17_PM.png)

See merge request !24

New packages links for 7.5

Added packages for the latest GitLab Version 7.5.1

See merge request !249

Add 7.4.5-ee packages

See merge request !248

Fix typo in documentation

Fixed a typo in a link to a configuration sample that was pointing to a non-existing page.

See merge request !245