Fix prompt
Add test for _id added
Remove extra data fields
Remove extra fields created by fullCalendar

The fullCalendar library adds a bunch of extra stuff to the event object when you save it the second time.
I think a lot of this stuff is basically previous values, etc. which come in handy when the object
is being used, but are not required when persisting the object.

This feature removes those extra fields when persisting the data.