adding test for django 1.7
adding victorgutemberg to contributors
adding sdee to contributors
adding missing github usernames at contributors file
Merge remote-tracking branch 'origin/master'

* origin/master:
  Fixed spelling
removing unecessary linebreak in documentation
removing commented line
documenting default behaviour of permissions and role verification function for super users
removing misplaced colon
using 'granted' insted of 'permited' in documentation
requiring django verions older than 1.8