Pass feedback data on assessment:complete

Removed the use of the tutor for the results to make use of a results
component.
Removed hardcoded attribute values

_isEnabledOnRevisit and _canShowFeedback are no longer hardcoded for the
assessment and can be set in the JSON as required.
Merge branch 'feature/results' of https://github.com/cgkineo/adapt-contrib-assessment into develop-merge