0.1.6:
 * Renamed WRMT::update() to WRMT::update_all()
 * Added WRMT::WiiRemote#update()
 * Added WRMT::WiiRemote#play_sound()
 * Added WRMT::WiiRemote#buttons()
 * Added WRMT::WiiRemote#motion_x()
 * Added WRMT::WiiRemote#motion_y()
 * Added WRMT::WiiRemote#motion_z()
 * Added WRMT::WiiRemote#ir_found()
 * Added WRMT::WiiRemote#ir_size()
 * Added WRMT::WiiRemote#ir_x()
 * Added WRMT::WiiRemote#ir_y()
