[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 migration should have happened already here.  If the students table does not already exist, then we have a problem and perhaps a error should be raised (instead of quietly not doing anything).  The app won't be able to fully run without it.