#755 Add move_request collection to data model.
Add method add_move_request to mongoconnector.
#755 Add add_move_request to DataHandler interface.
#755 Add get_open_move_request method to DataHandler interface.
#755 Add a move_request record to the database when a MOVE request is received. This will add one move_request per blocker.
#755 Process a move request acknowledgment by confirming the acknowledgement to the blocked.
#755 Fix late-night mistake (method expecting too many parameters).
#755 Add remove_move_request method to mongoconnector.
#755 Add remove_move_request method to DataHandler interface.
#755 Remove the move_request after acknowledging it back to the blocked.
#755 Late-night mistake (find instead of remove).
#755 Update add_move_request method so that it doesn't add duplicate move requests for the same Blocker/Blockee combination.
#755 Update move acknowledgement message to contain the blocker's name.
#755 Add random_number_generator in case it's needed to generate IDs for move_requests.
#755 Respond to blocker where there are no open move_requests for them.
#755 Being pedantic about wording.
Merge branch 'feature/#755_Reply_to_confirm_move' into develop