Adds settings menu to the top for editting and leaving projects

@creamzy @skyruler @dzaporozhets 
Menu contents depends on user's rights.

Fixes #4221


![Screen_Shot_2015-12-23_at_10.02.47_PM](/uploads/daeaef937bf9d9f4db7ccb674e344ac1/Screen_Shot_2015-12-23_at_10.02.47_PM.png)
![Screen_Shot_2015-12-23_at_10.02.41_PM](/uploads/58eb4eea7d640f01d7f05c2a408a2c04/Screen_Shot_2015-12-23_at_10.02.41_PM.png)
![Screen_Shot_2015-12-23_at_10.02.55_PM](/uploads/4b2ae027a13efcbad3eb81b04f134c4f/Screen_Shot_2015-12-23_at_10.02.55_PM.png)
![Screen_Shot_2015-12-23_at_10.04.47_PM](/uploads/bd5d9d8ddd72d16d74c32c6c1f569776/Screen_Shot_2015-12-23_at_10.04.47_PM.png)


See merge request !2195