Feature/issue 42 refactor award scenario

- Removed points from award scenario
- Created an answer method for participant which updates points and creates the answer object
- Default question points to 1
- Added a data migration to set all question points to 1
- Add a data migration to recalculate a user's points based on the answer objects, rather than point object
- Added tests for the new & refactored methods
- Did not remove PointsBonus yet, so that if learners complain after the migration, we have some sort of frame of reference.