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

When projects were created in projects_controller
create.js.haml passed notice as url parameter and
therefore notice was not displayed in the page after
redirect to the project page

Replaces two calls that this method simplifies

Didn't bother with files in db/, config/, or features/

see edd81a79

Project - restyled show page, removed info page
Repository - restyled show page, added download option
Tags - added download options

Project activities perfomance increased. Cache for project activitites disabled. Repository conception changed