Do not log presence changes to the console.

muc.js

                 $(document).trigger('role.changed.muc', [from, member, pres]);
             }
         }
+
         // Always trigger presence to update bindings
-        console.log('presence change from', from, pres);
         $(document).trigger('presence.muc', [from, member, pres]);
 
         // Trigger status message update