Add project permissions to all project API endpoints

This standardizes all the project API formats. Also needed to support Huboard.

See merge request !2090

border bottom for last comment fixes double line issue

Since image uploading isn't working atm. Will upload screenshots when it works again. 
https://unsee.cc/mosapine/
Fixes #3955 

See merge request !2175

New buttons

OLD
![Screenshot_2015-12-22_21.42.59](/uploads/79e85727586f7b917b8ab9ef867e79dc/Screenshot_2015-12-22_21.42.59.png)

NEW
![Screenshot_2015-12-22_21.42.21](/uploads/aee54160f17e0502e14ca5c754dcfe50/Screenshot_2015-12-22_21.42.21.png)


See merge request !2179

Fix method that ensures authentication token

Until now, `ensure_#{token_filed_name}!` method didn't persist new token in database.

This closes #4235.

See merge request !2185

Bump jquery-rails to ~> 4.0.0, jquery-ui-rails to ~> 5.0.0

Closes #2859 

See merge request !2183

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

Link to the gitlab-ci.yml file of GitLab itself.

I'm hunting for this link from time to time in customer demo's so I think it is useful to add.

/cc @ayufan 

See merge request !1993

Bump sass-rails to ~> 5.0.0

Addressing gitlab-org/gitlab-ce#2857

See merge request !2184

Improve emoji picker

This request uses an emoji image sprite to show big set of emojis. The sprite has been made based one gemojione gem images. The categories are retrieved from https://github.com/jonathanwiesel/gemojione/blob/master/config/index.json as well.

Some categories are pretty poor, it can be extended in the future.

It's a first step on the way to improve picker.

The first implementation was using https://github.com/iamcal/emoji-data project, but there was huge incompatibility with gemojione emojis set and I had to drop that solution.

![Screenshot_2015-12-22_23.26.27](/uploads/7d323eb0586204ac92915b41233b97ec/Screenshot_2015-12-22_23.26.27.png)


See merge request !2172

`runners_registration_token` now creates a new token if it is blank.

Make CI Lint form synchronous

This removes `remote: true` from CI Lint form, making it synchronous
form. This also removes some complexity related to displaying lint
messages.

View also has been updated, removed deprecated Bootstrap 2 tags.
Improved design.

See merge request !2171

Until now, `ensure_#{token_filed_name}` method didn't persist new token in database.

This closes #4235.

Fix and test leave project display

The 'Leave this project' display on project page was broken. It was calling the method incorrectly, which returned `nil` and displayed nothing. 

This fixes the display and also adds 2 different tests for it.

cc/ @jvanbaarsen @stanhu Please review and merge if you think it looks good. Thank you!

See merge request !2166

This standardizes all the project API formats. Also needed to support Huboard.

New group page

Implementing from https://gitlab.com/gitlab-org/gitlab-ce/issues/3480#note_2722988

cc @skyruler 

For https://gitlab.com/gitlab-org/gitlab-ce/issues/3480

See merge request !2174