Merge pull request #173 from adamarla/master

I thought this bug was fixed earlier
Show worksheet scans instead of question previews for worksheets in student outbox
Merge branch 'master' of https://github.com/abhinavc/web-application
Forgot to process json response of worksheet/scans
Grader must now provide a reason for rejecting a dispute ...

The reason is sent in a mail to the student
Minor bug fixes and enhancements in accepting / rejecting disputes logic
Minor bug fix
Minor edits
Minor styling changes in sektion listing
Allow rendering of any icon within a .line
Added a new .png for later use
Tracking how many times results for a worksheet were viewed by students and teachers ...
Added a new query method - viewed_by ( :student | :teacher )
multi-page question support
Merge remote-tracking branch 'upstream/master'