Updating to OpenZeppelin 2.0, Truffle 5 as of 30 Dec 2018

1. in truffle-config.js specify solidity 0.4.25
2. your contact is now derived from ERC721Full and path is openzeppelin-solidity
3. you need to implement exists(uint tokenId) in your contract

function exists(uint256 tokenId) public view returns (bool){

return super._exists(tokenId);

}