Fixed small bug.
Added the right utf8 headers.

Conflicts:

	controllers/queues.py
Added review as percentage of overall grade option.

Conflicts:

	controllers/queues.py
	controllers/rating.py
	models/db.py
	models/tables.py
New license.
Merge remote-tracking branch 'github/luca' into mshavlov
Function for changing all users' passwords is added into maintenance.py