converted the normalized score to a percentage (whole number)

- the conversion is done at the model level
- on the interface, we appended '%' for more clarity
- in the report we added 'Percentage Score for' at the front of
each criteria to let the user know what the numbers mean
	- if we just append '%' to the end of the numbers, Excel
	and text editors seem to append decimal places to them.
filtering feedback for Tickeet #156

- any users that can manage the course (instructors / TAs) can view
all feedbacks
- any users that cannot manage the course (students) can view all
feedback for their own answers and any feedback that are not from
the evaluation or self-evaluation process for others' answers