Eliminate a 404 error when user is not logged in and attempts to visit
a project page.
The 404 page will still show up when user is logged in and the project
doesn’t exist or the user doesn’t have access.
Added visibility_level icons to project view (rather than just text).
Added public projects to search results.
Added ability to restrict visibility levels standard users can set.
* Render right layout depends on current_user
* show sample git username/email when repo is empty
* Show extra info when browsing public area
* Fixed some tests related to public projects
* show comments in read-only for public projects
* Remove old public routing
