contract Ownable {
  address public owner;


  /** 
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
        * account.
             */
  function Ownable() public {
    owner = msg.sender;
  }


  /**
   * @dev Throws if called by any account other than the owner. 
        */
  modifier onlyOwner() {
    require(msg.sender == owner);
    _;
  }


  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
        * @param newOwner The address to transfer ownership to. 
             */
  function transferOwnership(address newOwner) public onlyOwner {
    if (newOwner != address(0)) {
      owner = newOwner;
    }
  }

}
/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control 
 * functions, this simplifies the implementation of "user permissions". 
 */
function Ownable() public {
    owner = msg.sender;
  }
/** 
 * @dev The Ownable constructor sets the original `owner` of the contract to the sender
 * account.
 */