remove unused code
use includes to avoid N+1 queries
use includes in adm
lots of fixes in adm
moved all functionality of require_login and require_admin to cancan. Renamed projects/backers methods review and thank_you to create and show respectively. Refactored lots of stuff. All controller tests green. Still need to fix features specs
fixed ability spec
Merge branch 'master' of github.com:danielweinmann/catarse into refactor_users