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

Fix public issue

See merge request !1717

Update installation and upgrade documentation

See merge request !1714

Fix service UI

There was a small bug in the service UI that caused an empty 'Trigger' label to be shown. After this change the 'Trigger' field is not shown when only one event type of supported.

Before:
![Screen Shot 2015-03-16 at 7.40.31 PM](https://gitlab.com/uploads/dblessing/gitlab-ce/0457a0b918/Screen_Shot_2015-03-16_at_7.40.31_PM.png)

I think in the future there are other things we can do to enforce at least one selected event type and also show the user what the singular event type is if only one is supported. That will take time to work out and this is definitely acceptable for the time.

See merge request !395

Delete deploy key when last connection to a project is destroyed.

Addresses #1959.

See merge request !1710

Subscription to issue/mr

Fixes #1911 and #1909

![joxi_screenshot_1426601822159](https://dev.gitlab.org/gitlab/gitlabhq/uploads/53021bc5783271322ab2dfba7598eaa3/joxi_screenshot_1426601822159.png)

![joxi_screenshot_1426601836423](https://dev.gitlab.org/gitlab/gitlabhq/uploads/244ff360fbd6f30980f8dad699400814/joxi_screenshot_1426601836423.png)

See merge request !1702