Merge pull request #2 from nwpan/master

Merging nwpan/Distributed-System--Rating-System because I'm a boss.
added coalesce and updated merge_clock method but still need to return the results
added a function final_rating_result that returns the result as {rating, choices, clock}.  it also now saves the final rating with key = '/final_ratings/' + entity
just removed line makign sure VM has right stamp on commits
updating sync_with_neighbour_queue