Add note about minimum GitLab CI version

Documentation update: To use variables in `.gitlab-ci.yml` it's not enough to update the GitLab Runner, a minimum version of GitLab CI is needed as well.

See merge request !2514

Split from !2455

References #9092

See merge request !2515

Gracefully handle invalid UTF-8 sequences in Markdown links

Closes #6077

See merge request !2382

Add sentry integration

Sentry is an event logging platform primarily focused on capturing and
aggregating exceptions. With this MR it will be possible to log and
track exceptions from GitLab to Sentry.

https://gitlab.com/gitlab-com/operations/issues/39

See merge request !2485

Use ENV variables for Unicorn worker killer & increase default limits

Merge request that lead to this particular merge request:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2421

[ci skip]

See merge request !2513

Upgraded gitlab_git to fix issue #5858

This updates the dependency on gitlab_git and fixes #5858 - reproduced locally and issue disappears with the change.

Related MR that actually adds branch name support to commits_between: https://gitlab.com/gitlab-org/gitlab_git/merge_requests/61

See merge request !2516

Fixes tooltip doesn't duplicate the "me" name.

Checks that "me" is not in the array of names in tooltip

![emojilist](/uploads/20b1a39cda194358f9730ec3c6b86acb/emojilist.gif)

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/7978


See merge request !2454

Adds "t" as a shortcut for find file anywhere



See merge request !2507

Fixed invalid JSON in first JSON Example

Just a comma missing

See merge request !2487

Closes #6077

Update Issues/MRs updated_at field when notes are generated

Closes #3749 and #9130

See merge request !2493

Remove `Compressed to` column from build artifacts browser

See #10982.

See merge request !2509

Using this limit on GitLab.com it appears we're able to reduce response
timings by about 620 milliseconds compared to the previous limit.

See gitlab-org/gitlab-ce!2421 for more information.

This makes it easier for users to use their own limits based on their
server configuration.

[ci skip] Fixed minor typo in workflow documentation

This change is self-explanatory.

See merge request !2503

Conflicts:
	db/schema.rb

See #10982.

Code was failing because branch was named `'test'` with quotes
which was escaping the javascript I was using.

Also adds autocomplete="off" to find input.

- Add attribution for Anton Baklanov
- Remove attributions for employees

[ci skip]

Added X-GitLab-... headers to emails from CI and Email On Push services

Fixes #2098

This adds the 'X-GitLab-Project', 'X-GitLab-Project-Id' and
'X-GitLab-Project-Path' headers to emails from CI and Email On Push in a way
that it is done currently for merge requests and issues emails.

Additionally, CI emails will have 'X-GitLab-Build-Status' header with either
'fail' or 'success'.

Emails from Email On Push will include 'X-Gitlab-Author' header containing the
username of user who did the push.

See merge request !2159

sometimes `@ref` will be `nil`.
this makes sure that the correct branch is passed in.

Allow LDAP users to change their email if it was not set by the LDAP
server

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/3054

See merge request !2502

Add public params to GET /projects api. Closes #3788



See merge request !2409

Starring project only increases star count

This is instead of increasing star & fork count

Fixes #11396

![star-count](/uploads/9a1d569393bc051d1a019f0340eec957/star-count.gif)

cc. @jschatz1 

See merge request !2504