Optimize Project#ci_service(s)

Related issue: gitlab-org/gitlab-ce#14186

See merge request !3158

Fixed quick submit on note edit

Also removed the cloning of forms for note edits. Instead it just hides/shows the form seeing as it is already there

Closes #14094

See merge request !3151

The method Project#ci_services would load all services into memory
(including _all_ their columns) and then use Enumerable#select to reduce
the list. Project#ci_service in turn would further reduce this list down
to just 1 Service instance.

Instead of doing all this in Ruby we can just offload the work to the
database, reducing the amount of time spent in these methods. These
changes reduce the time of the first call to Project#ci_services from
around 240 ms to around 10 ms, though the final timings will vary based
on database load. Because Project#ci_service is memoized there's no
further overhead introduced by using a database query.

Fixes gitlab-org/gitlab-ce#14186

Fixes issue with markdown snippet not being copyable

On markdown snippets this adds a hidden div with the raw markdown content so that it can be copied

Closes #13882

See merge request !3153

New dropdown UI

See #3279 for the designs

See merge request !3110

Element with the content being copied cant be hidden so instead i\'ve moved it off the screen

Fix projects pagination via ajax

Basically was not implemented. Finishes our projects list refactoring. 
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !3155

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

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

On markdown snippets this adds a hidden div with the raw markdown content so that it can be copied

Closes #13882

Also removed the cloning of forms for note edits. Instead it just hides/shows the form seeing as it is already there

Closes #14094

See #3279 for the designs

Added specs for Issue#referenced_merge_requests

Added these while looking into https://gitlab.com/gitlab-org/gitlab-ce/issues/13651.

See merge request !3125

Add shortcut to toggle markdown preview

Allow to toggle markdown preview with shortcut `ctrl+shift+p` (`cmd+shift+p` on OSX).

- If the user is focused on a md textarea, `ctrl-shift-p` will show the preview, otherwise native browser event is fired
- The textarea is re-focused after disabling the preview tab
- Results of markdown render is cached for fast toggles

I'm on linux, so if someone can test it on OS X, it would be great!

Closes #14038

See merge request !3111

Retry bundler and apt-get



See merge request !3146

Fixed the GitPushService specs

See merge request !3139

Add a `gemojione:sprite` Rake task

This task will generate a standard and Retina sprite of all of the
current Gemojione Emojis, with the accompanying SCSS map.

It will not appear in `rake -T` output, and the dependent gems are not
included in the Gemfile by default, because this task will only be
needed occasionally.

See merge request !3130

Fix error 500 in Todos

Closes #14095 

Closes #14075 

Closes #14109

Closes #14151

See merge request !3141

This task will generate a standard and Retina sprite of all of the
current Gemojione Emojis, with the accompanying SCSS map.

It will not appear in `rake -T` output, and the dependent gems are not
included in the Gemfile by default, because this task will only be
needed occasionally.

[ci skip]

Snippet visibility badge spacing

Closes #14074 

![Screen_Shot_2016-03-08_at_08.40.32](/uploads/f55ca724fbf0e247b299a2702c3b55f5/Screen_Shot_2016-03-08_at_08.40.32.png)

See merge request !3122

Commit limits

Prevent timeouts when creating/viewing Merge Requests with many
commits. Also, reduce the number of commits shown in the UI from 500
to 100.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/14031

This MR avoids Unicorn timeouts in some places and takes 4.5 seconds
off load times in others, when manually testing with a 4500-commit
compare/MR in the linux repo. It does not limit the number of Commit
objects instantiated in memory, just the amount of HTML generated. It
seems that having 4500 commits objects is not a problem in itself. If
it ever becomes one we could do something for Commit objects like we
did for Diff (introduce a CommitCollection or something).

See merge request !3095

Bump poltergeist to `~> 1.9.0`



See merge request !3116

This fixes the remainder of the GitPushService specs.

These were broken by commit 21a05328.
Two JIRA tests remain broken but I can't quite figure out how to fix
them.

Retry failed tests

This is to make the CI builds more reliable due to large amount of timeouts and deadlocks recently.


See merge request !1793