Also adds capybara-screenshot, which will automatically save the page as
html and an image whenever a feature fails. Handy for debugging.

[ci skip]

Refactor ReferenceExtractor

See merge request !557

Also matches CommitReferenceFilter's new behavior of always using short
SHAs in the link text.

Now when a user pastes a full SHA like
`d7f61aff`, its link text will only show
`d7f61aff` for brevity.

Fix bug where Slack service channel was not saved in admin template settings

Consolidate allowed parameters in one place to avoid these kinds of bugs in the future.

Closes https://github.com/gitlabhq/gitlabhq/issues/9181
Closes #1501

See merge request !574

Simplify the `skip_before_action` logic for UploadsController

See merge request !547

Improve mobile UI for dashboard and project pages

Some love for mobile UI 😃

## Before
- - -
![Screenshot_2015-04-24-17-42-59](https://gitlab.com/dzaporozhets/gitlab-ce/uploads/827f9cefa477fc7f0d1b2d56e479a35c/Screenshot_2015-04-24-17-42-59.png)
![Screenshot_2015-04-24-17-27-01](https://gitlab.com/dzaporozhets/gitlab-ce/uploads/698eb90033d40ea7de9f599364a34d0e/Screenshot_2015-04-24-17-27-01.png)

## After
- - -

![Screenshot_2015-04-24-17-16-08](https://gitlab.com/dzaporozhets/gitlab-ce/uploads/7e3ad8bc18800f63a7be20ea31ccfd3b/Screenshot_2015-04-24-17-16-08.png)
![Screenshot_2015-04-24-17-39-18](https://gitlab.com/dzaporozhets/gitlab-ce/uploads/cde3379836530d95e94922ba5c200cef/Screenshot_2015-04-24-17-39-18.png)
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !573

Consolidate allowed parameters in one place to avoid these kinds of bugs in the future.

Closes https://github.com/gitlabhq/gitlabhq/issues/9181

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

Don't allow username to end in period.

Fixes #2174 and #2249.

cc @jacobvosmaer Please review and test with the GitLab.com dump.

See merge request !1786

Add issue and merge request count for state filters.

Related to issue #2170

Changes relate to project issues and merge request pages, dashboard and group pages remain the same.

See merge request !1747

Make source code on GitLab more prominent.

See merge request !1741

This reverts commit c0116926.