Merge branch 'slack_integration' into 'master'

Slack integration

See merge request !1151
number formatting fix
webbrowsers -> web browsers
support latest firefox esr release
Merge pull request #7974 from bbodenmiller/patch-2

number formatting fix
Merge pull request #7975 from bbodenmiller/patch-4

webbrowsers -> web browsers
Refactor task list tests and coffeescript
Display renamed files in diff views

Show both the old and new filenames when viewing the diff for a renamed
file.
Add tests for tree edit routes

Critical because of possible confusion between /:id/preview
and /:id for a path that ends in preview.
Snippets: rename public to internal
Merge pull request #7963 from cirosantilli/factor-previewable

Factor markup? || gitlab_markdown? into new method
Merge branch 'remove-annoying-i18n-deprecation' into 'master'

Remove annoying i18n deprecation

Thanks to this guy http://stackoverflow.com/a/20381730

Fixes #527

See merge request !197
Merge branch 'master' of gitlab.com:gitlab-org/gitlab-ce
Merge branch 'master' of github.com:gitlabhq/gitlabhq
Use double quotes because we are inserting password now.
Merge branch 't1254-snippets-refactoring' into 'master'

Snippets refactoring: rename public to internal. STEP 1

See merge request !1157
Replace www.gitlab.com with about.gitlab.com
Style merge request CI widget to match MR/Issue box

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Add a bit of space between star icon and text

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Developers can push to wiki repo. Protected branches does not affect wiki repo any more

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