Fix checkbox alignment in application settings

Add the form-control CSS class to the feature checkboxes on the application settings page to fix the vertical alignment with their labels.  See #2053.

Also add aria-describedby attributes to form controls that have a help text block (http://getbootstrap.com/css/#callout-help-text-accessibility).

## Before

![Admin_area___GitLab](https://dev.gitlab.org/Okada/gitlabhq/uploads/2736fe81ba564b43cbef37cd187cf47a/Admin_area___GitLab.png)

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## After

![Admin_area___GitLab_-_after](https://dev.gitlab.org/Okada/gitlabhq/uploads/95a8a26600458c9c55bc05d2e0c6be47/Admin_area___GitLab_-_after.png)

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This doesn't address the help text block for the twitter checkbox.  @dzaporozhets Do you want to keep the help text visible or would you rather put it in a dialog and hide it initially?

cc @sytse

See merge request !1615

Update rugments, fixes #8900

Improve projects list

* Add search filtering for group projects
* Show all user projects on dashboard
* Refactor projects list into one view
* Hide big list of projects with 'Show all' button

For #2069

See merge request !1636

Increase timeout for Git-over-HTTP requests.

Fixes #2081 and https://gitlab.com/gitlab-org/gitlab-ce/issues/232.

Normal web requests are bound by the `Rack::Timeout` timeout of 60 seconds, while Grack Git-over-HTTP requests are only bound by Unicorn's timeout which is now set to 1 hour, which should be plenty.

The omnibus package should be updated to no longer use `unicorn['worker_timeout']` for the Unicorn timeout, but to set the `Slowpoke.timeout`.

See merge request !1619

* Add search filtering for group projects
* Show all user projects on dashboard
* Refactor projects list into one view
* Hide big list of projects with 'Show all' button

Update spring to 1.3.3

See merge request !1635

Re-annotate models

See merge request !1634

Add more Slack notifications for issue and merge request events

From https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/237 by Stan Hu.

See merge request !1556

Web Hook sends email of pusher

See merge request !1630

Add Service Templates to CHANGELOG

See merge request !1633

Advise on how to help others.

See merge request !1632

Bump gitlab_git to rc15

For #2033

See merge request !1631

Add dashboard milestones.

Closes #1422.

![Screen_Shot_2015-03-03_at_16.20.36](https://dev.gitlab.org/gitlab/gitlabhq/uploads/795b480a2552e1d26436c3db2158cb81/Screen_Shot_2015-03-03_at_16.20.36.png)

See merge request !1621

Connect GitLab buttons doc

The "GitLab buttons in Gmail" documentation was not linked from anywhere else.

Instead of assuming that these docs are not current, or should not be accessible, I've linked to them from doc/integrations/README.md.

If linking is the less desirable approach, please advise.

See merge request !339

Merge branch 'connect_gitlab_buttons_doc' of gitlab.com:perforce/gitlab-ce into connect_gitlab_buttons_doc

else. It is now linked.

Autosave title and description of new issues/MRs.

Closes #2048.

See merge request !1595

Commits statistic grammar

Fixes #2089

Changed spelling from Commits statistic to Commit statistics

See merge request !1625

Changed to 'View Build Page'

Fixes #2093

Changes 'Build Page' to 'View build page'

See merge request !1626

Fix namespace in merge request url building

Changes in 42387b73 now require namespace specification and broke abc69c89.

There are additional helper functions in c530ca00, but this seemed easier not to rely on them.

See merge request !363