Improve admin section

fix resque start

Projects count at dashboard

* layout: add 'Groups' item to main_menu
* admin/dashboard: add a ui-box for groups
* projects and groups: remove nav tabs

Add a link to each project on the Issues dashboard

Fix #2058 diff problem of non ascii paths and non utf-8 file encoding

Fix code highlighting

Remove SQLite support

Rewrite and improve git backend logic. Fix project movind. Raise exception to prevent unexpected issues

Project -> update repo only on create and destroy. Fixtures Updated with namespaces. Fixed moving repo

fix destroy project from admin

User/Group namespaces for projects