[CYB-103] Gallery Comments now register in back end

Front end Gallery Comments reflect in the back end as Comment Objects and Activity Objects

https://jira.ets.berkeley.edu/jira/browse/CYB-103
The line above (line #6) is pulling in submissions from all students for this course.  Here, the data on a single student is being appended to the json returned.   Is that what the front end needs: all submission (for all students in the course), plus the current student?