contract Pausable is Ownable {
  bool public stopped;
  event onEmergencyChanged(bool isStopped);

  modifier stopInEmergency {
    if (stopped) {
      throw;
    }
    _;
  }

  modifier onlyInEmergency {
    if (!stopped) {
      throw;
    }
    _;
  }

  // called by the owner on emergency, triggers stopped state
  function emergencyStop() external onlyOwner {
    stopped = true;
    onEmergencyChanged(stopped);
  }

  // called by the owner on end of emergency, returns to normal state
  function release() external onlyOwner onlyInEmergency {
    stopped = false;
    onEmergencyChanged(stopped);
  }

}
function emergencyStop() external onlyOwner {
  stopped = true;
  onEmergencyChanged(stopped);
}

// called by the owner on emergency, triggers stopped state