Added issue title to page title

* Fixes: #5966
Remove chosen gem

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Replace chosen with select2

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Select2 dropdown autoWidth

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Remove chosen from tests

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Remove include of un-existing helper

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Fix for edit user as admin

* It fixes an issue where you where able to remove your own
  admin rights. This would result in a 404 error. fixes: #2283
* It fixes an issue where you would be able to block your own
  account on the edit page. This fix makes the behaviour the same
  as on the admin/users overview page
Include missing helper for project_forked_merge_requests tests

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Merge branch 'select2' of /home/git/repositories/gitlab/gitlabhq
Merge pull request #6025 from jvanbaarsen/fix-for-admin-user-edit

Fix for edit user as admin
Merge pull request #6022 from jvanbaarsen/issue-title-in-title

Added issue title to page title
Removed expiration from snippets

* Removed the expiration from the project snippets
* Fixed the layout for the project snippets