Fixed group links dropdown to match

This ports some code over from EE to reduce conflicts

Moved most of the functions that contained "window.doSomething" that were located at:
- app/assets/javascripts/application.js
To the following file:
- app/assets/javascripts/lib/utils/common_utils.js

The functions listed here:
- window.ajaxGet
- window.split
- window.extractLast
- window.rstrip
- window.disableButtonIfEmptyField
- window.disableButtonIfAnyEmptyField
- window.sanitize
- window.unbindEvents
- window.shiftWindow

Now will be accessible from the "gl.utils" namespace

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

Removed un-required CSS

Fixed spacing with buttons
Disables group form when user doesnt have correct permissions

Hides time on mobile

Added group name to members row
Fixed saving group member

Combine both group members & project members in project members list