CYB-310 - Gallery: one comment equals two views

https://jira.ets.berkeley.edu/jira/browse/CYB-310
CYB-269 - Add date stamp to comment & sort newest first

https://jira.ets.berkeley.edu/jira/browse/CYB-269
Merge pull request #190 from christianv/CYB-310

CYB-310 - Gallery: one comment equals two views
CYB-314 - After sharing, student sees only self

https://jira.ets.berkeley.edu/jira/browse/CYB-314
Merge pull request #191 from christianv/CYB-314

CYB-314 - After sharing, student sees only self