Fix push access check when not signed in.

Was causing 500 on MR, Blob, Tree pages.

Fixes https://github.com/gitlabhq/gitlabhq/issues/8637 and https://github.com/gitlabhq/gitlabhq/issues/8813.

See merge request !1542

Fix user page performance

See merge request !1543

Escape process text

Performance improvements

* More efficient DB queries
* Cache ApplicationSettings per request
* Dont query for objects you dont need

See merge request !1540

Add "NEWS" to no_highlight_files

"NEWS" is used in gnu style opensource projects for the changelog. So let's add it to `no_highlight_files`.

See merge request !249

Fix Markdown relative links to files with anchors.

Fixes #2016.

cc @marin

See merge request !1541

The Feature request copy paste text was not properly escaped.

Improve user profile page

See merge request !1539

TestEnv improvements

Affix milestone/assignee UI element

See merge request !1536

Remove Group#owner_id from API

For #1943

See merge request !1537

Hide Gitlab.com import for GitLab.com

See merge request !1538

Add new style to "New group" button

Bump gitlab shell

See merge request !1535