Use the configured display name in e-mails from Devise mailer

By default, it is set to "GitLab", but a user may configure the display name to something else.

See merge request !613

Improve help line for restricted domain signups

The setting may be misconstrued as only allowing access from certain domains. Add help to clarify this applies to e-mail domains.

See merge request !612

Fix CI links on MR page

Fixes gitlab-org/gitlab-ci#145

See merge request !609

Docker: update omnibus package

See merge request !605

Update spelling in comments in authentication.rb

Improve documentation of configuring external issue trackers

There was some confusion over the deprecated `:issues_tracker_id` field. Added documentation.

Closes #1514

See merge request !580

Closes #1514

correct spelling

Added " How to maintain tight control over the number of active users..."

Added " How to maintain tight control over the number of active users on your GitLab installation" to documentation.

Please check that documentation is OK before accepting Merge. I took if from https://gitlab.com/gitlab-org/gitlab-ce/blob/master/config/gitlab.yml.example#L149

cc/ @sytse

See merge request !1792

Fix Error 500 when searching Wiki pages

If a Wiki page turns up a hit in the search results, an error will occur:

```
Completed 500 Internal Server Error in 836ms

NoMethodError - undefined method `slug' for "test.markdown":String:
  app/helpers/wiki_helper.rb:10:in `namespace_project_wiki_path'
  app/views/search/results/_wiki_blob.html.haml:4:in `_app_views_search_results__wiki_blob_html_haml___2752621660395393333_70299911622700'
  actionview (4.1.9) lib/action_view/template.rb:145:in `block in render'
  activesupport (4.1.9) lib/active_support/notifications.rb:161:in `instrument'
  actionview (4.1.9) lib/action_view/template.rb:339:in `instrument'
  actionview (4.1.9) lib/action_view/template.rb:143:in `render'
```

An unhandled String containing the name of the Wiki page would be provided to the URL path generator. This MR handles that case.

Closes #1547

See merge request !592

Add current_sign_in_at to api User

Unescape branch names in compare commit

The upgrade in GitLab v7.9 to Rails v4.1.9 caused all branch names in the compare commit mode to be escaped (e.g. `/` to `%2F`). The compare mode would not always work when comparing against branch names with a forward slash.

Opted to unescape the branch name rather than use a wildcard segment to prevent escaping slashes because it seems like a more sensible URL. The slashes in this case aren't really represented by a tree structure (e.g. /compare/one/two/branch..another/branch/here).

* Closes #1399
* Closes https://github.com/gitlabhq/gitlabhq/issues/9105

See merge request !582

Re-annotate models

Re-ran `annotate` to fix model annotations.

See merge request !603

Fix config template from parse errors

62aa05dd added comments that were not commented out. CI test builds do a `cp gitlab.yml.example gitlab.yml` and thus were failing.

See merge request !602

Fix file paths for installations from the source

See merge request !583

Add snippet visibilty as parameter to API doc, closes #1562

## Description

Snippet visibility level was added to API but was not to its documentation.

Related to following commit: 928fc94c

@axil Can you review?

See merge request !601

add missing word to changelog

Remove duplicate CHANGELOG line for v7.10.0

The other one is 3 lines below the removed.

[ci skip]

See merge request !563

Update config.yml.example

See merge request !597

Fix #6417: users with group permission should be able to create groups via API

Group milestones by title in the dashboard and all other issue views