876 | Handle CommCare received_on header

https://trello.com/c/h0ZrZxAZ

Added "received-on" headers from the form push has been exposed in the object.
Fixed some syntax errors.

Change-Id: Ia32fcee9d174f66fbc7418d09c13bd5bd45a29d3
Merge "876 | Handle CommCare received_on header"