Added ECN students
FIX for issue 1029, add indicator for new annotations from remarking
Assignment update should return HTTP 200 Success
FIX for issue 1013 - also includes fixes bugs  not logged but related and  discovered while fixing 1013
Additional related fix to issue 1020
Merge pull request #1063 from m-wu/issue-1029

Add indicator for new annotations from remarking.
Closes #1029
Merge conflicts resolved
Fix: tests with remark request
Merge pull request #1064 from akwok18/issue-1013

Includes fixes to related bugs that were found (not logged)
Closes #1013 ; Closes #1020
Fixes issue 1069
Merge pull request #1065 from benjaminvialle/tests

Fix: tests with remark request
Merge pull request #1061 from benjaminvialle/ECN

Added ECN students
Update test_results
Merge pull request #1075 from danielstjules/issue-1002

Update Test Results
Closes #1074 : UI - Post deadline submissions

addition of a warning in the results/edit page for a post deadline
submission.
Checking in the controller instead of the view

Changing class 'error' with 'warning'
Another bug I forgot
Light cleanup
No longer forces collection id's to be numeric.
Allow API requests to use content negotiation with the Accept header
Changing location of the method past_due_date? in model Grouping