Updating HangoutTracker.py

Comments from Chat earlier today (SixFootTurkey) indicated that they did not like the user name being displayed on a \hangout call, because it was dinging them with the hangout being old.  Since we cannot figure out if the hangout is currently active, I decided to remove that part of the syntax all together.  I also went in and added additional syntax checks to the match line so that if Emily[iOS] joins the Channel, it automatically kicks off the message parsing and displays it to the room so I don't have to try and type \hangout while driving or waiting for a stoplight.