Doc: Added FreeOTP to 2FA

I have just added a note about a free alternative to Google Authenticator to the documentation of your two factor authentication.

See merge request !777

Remove line under project description

## Before

![Screenshot_2015-06-05_19.44.39](https://gitlab.com/gitlab-org/gitlab-ce/uploads/e80e03a15ff32de489e61662674f8b70/Screenshot_2015-06-05_19.44.39.png)

## After

![Screenshot_2015-06-05_19.44.19](https://gitlab.com/gitlab-org/gitlab-ce/uploads/d4e2eb43802dbeee397fb6bc051b82b2/Screenshot_2015-06-05_19.44.19.png)

See merge request !776

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

Fix css alignment in header. Use scss variable
Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !775

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

Refactor web editor

* fix problem with editing non-master branch
* before commit make sure branch exists
* dont allow user change file in one branch and commit to another existing branch
* remove a lot of code duplication
* remove outdated statellite errors
Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fixes #1761

See merge request !773

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

Show warning when a comment will add 10 or more people to the discussion.

Addresses internal issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2054

New issue:

![Screen_Shot_2015-06-02_at_14.48.46](https://gitlab.com/gitlab-org/gitlab-ce/uploads/6771ff8748b9b548a9f0f32a5a8b9bb1/Screen_Shot_2015-06-02_at_14.48.46.png)

New comment:

![Screen_Shot_2015-06-02_at_14.48.51](https://gitlab.com/gitlab-org/gitlab-ce/uploads/25ec5f06490e1e6b36e453e055a7b403/Screen_Shot_2015-06-02_at_14.48.51.png)

See merge request !754

Add info about WIP merge requests to docs.

Addresses internal issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2078.

See merge request !770

Fix timeout when rendering file with thousands of lines.

Addresses internal issue https://dev.gitlab.org/gitlab/gitlabhq/issues/2354.

See merge request !771

Try to explain Unicorn and unicorn-worker-killer

See merge request !1842

* fix problem with editing non-master branch
* before commit make sure branch exists
* dont allow user change file in one branch and commit to another existing branch
* remove a lot of code duplication
* remove outdated statellite errors
Signed-off-by: NDmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fix empty header margin

See merge request !769

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

Improve BitBucket integration documentation [ci skip]

This MR will improve the BitBucket integration documentation by

- mentioning the need to reconfigure GitLab after changing the configuration file, if you're using the omnibus package.
- adding a section about configuring a Host entry for bitbucket.org.
- switching additional steps 1 and 2, because connecting to BitBucket will only work after you added the SSH key and the Host entry.
- using sudo for the ssh connection in step 2, so that it is more obvious, that the git account should be used to establish the connection.

See merge request !670

Order commit comments in API chronologically

When fetching commit comments via API, the comments were not ordered,
but just returned in the order Postgresql finds them. Now the API always
returns comments in chronological order.

Same as !628 but with CI

See merge request !768

CI script: remove directives with default value

See merge request !1841

Remove Guard

None of the GitLab B.V. developers were using it.

See internal https://dev.gitlab.org/gitlab/gitlabhq/issues/2360

See merge request !764

Fix upgrader script

This is a fix for upgrader script not guessing the latest version correctly.

Upgrader now handles versions where a version part (major/minor/patch) can have multi-digit number, also ensures that the latest version is chosen from git tags by converting tag to Gitlab::VersionInfo and than selecting the latest/greatest version.

Fixes: #1476

See merge request !695

Make namespace API available to all users

### What does this MR do?

This MR makes it possible for a user to query namespaces to which he/she has access. Also, it adds documentation for the existing API.

### Why was this MR needed?

Even though the `groups` API exists, it might still be useful to have an endpoint that tells the namespace type (e.g. `user` vs. `group`), especially if a user has access to a number of different projects.

### What are the relevant issue numbers?

Closes https://github.com/gitlabhq/gitlabhq/issues/9328

See merge request !708