WIP | Release 7.9.1

See merge request !1738

Milestones and labels can be used even when issues are disabled.

When Issues are disabled for a project Milestones and Labels can still be used for Merge Requests.

See merge request !1739

Don't show commit comment button when user is not signed in.

Address private issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2167.

See merge request !429

This reverts commit af522ede.

Fix #8966 Remove Milestones/Labels from project navbar when Issues disabled

Include missing events and fix save functionality in admin service template settings form

### What does this MR do?

This MR includes missing settings left out in the Admin -> Service Templates page and fixes the inability to save certain settings.

### Are there points in the code the reviewer needs to double check?

No.

### Why was this MR needed?

Because the service template form was broken and untested.

### What are the relevant issue numbers / [Feature requests](http://feedback.gitlab.com/)?

#1275

Before:

![Screen_Shot_2015-03-23_at_5.53.19_AM](https://gitlab.com/stanhu/gitlab-ce/uploads/e1bff75f30a3b6ecb174d3e25c722b7e/Screen_Shot_2015-03-23_at_5.53.19_AM.png)

After:

![Screen_Shot_2015-03-23_at_5.53.13_AM](https://gitlab.com/stanhu/gitlab-ce/uploads/8fada00128a3d0951b3230fefa64be92/Screen_Shot_2015-03-23_at_5.53.13_AM.png)

See merge request !427

Fix "Import projects from" button to show the correct instructions

Closes #1267

See merge request !422

Conflicts:
	app/views/projects/new.html.haml

Fix OAuth2 issue importing a new project from GitHub and GitLab

It appears that the GitLab OAuth2 client options were converted to strings instead of symbols when merged with the default options (i.e. `{}.merge(github_options)`). As a result, the OAuth2 defaults were being used. For example, the OAuth2 client options would have a key with `authorize_url` and `:authorize_url`, but the former was never used. As a result, the OAuth2 client would always use the wrong URL to talk to GitHub.

Note that this bug should also have affected GitLab, but not Bitbucket: The OAuth client is careful to convert all keys to symbols.

Closes #1268

See merge request !425

Faulty LDAP DN name escaping removed

* move votes block to participants
* make smaller font in sidebar

This reverts commit 516bcabb.

Conflicts:
	Gemfile

Add canceled CI status

Fixes https://github.com/gitlabhq/gitlab-ci/issues/564

https://dev.gitlab.org/gitlab/gitlab-ci/issues/169

![Screen_Shot_2015-03-19_at_17.10.08](https://dev.gitlab.org/gitlab/gitlabhq/uploads/87f47d9fd1b1a60e0c5402eedd1a1566/Screen_Shot_2015-03-19_at_17.10.08.png)

See merge request !1729

Commits in push data should always be an array.

See merge request !1726

Backup repo with tar instead of git bundle

Fixes gitlab/gitlab-ee#246

See merge request !1723

Return `true` from `non_restricted_level?` when the
`restricted_visibility_levels` setting is nil.

Code for 7.9.0.rc2

cc @marin

See merge request !1719

More actively use css variabled to prevent colors duplication

See merge request !1715