fixed answer controller

fixed get real question in controller/answer.py
fix linux format
Added unittests
Moved to tests folder
Merge branch 'groep7' of github.com:v1kko/SWE_2013_Groep2 into groep7
new clean timer for answer form
Added get_unanswered_questions to answer.py/AnswerModel
Merge branch 'groep7' of github.com:v1kko/SWE_2013_Groep2 into groep7
LTI userID taken
Merge branch 'master' into groep7

Conflicts:
	controllers/answer.py
Edited answers.py/AnswerModel: trying to get a question that does not exists no longer throws exception.
Thus replaced try/except with if question is not None. Checked in browser, edited part seemed to work.