Closes #301: Additional fixes including ACL changes for Assessments and Assignments.
Closes #301: Fixes assignment id for when faculty are submitting a response.
Closes #301: fetch options fix.
Assessment page: Scopes the total number of assessments by cohort so that the pagination works properly.
Gradebook commenting and download submission fixes.
Adding GradebookDropbox assertion change by James.
Updated Gradebook Download submission(s) ACL check and added group by to Gradebook index page for Gradebook listing.
Updated Gradebook ACL rules.
Fixed assignment download and teacher response download link association.