def process_power_level(room, level)
      membership = (@memberships[room] ||= {})
      membership[:power] = level
      broadcast(:power_level, self, room, level)
    end
def process_power_level(room, level)
      membership = (@memberships[room] ||= {})
      membership[:power] = level
      broadcast(:power_level, self, room, level)
    end
Process a power level update in a room.

 @param room [Room] The room where the level updated.
 @param level [Fixnum] The new power level.