Test Arbitrator deployment on Kovan

[pimato]

• [ ] Use open-source dapp frontend to add our Kovan Arbitrator address locally
• [ ] set a small Arbitrator fee on the arbitrator contract
• [ ] create markets and let the Dxdao resolve it ???

[nicoelzer]

The integration has been build and can be tested on Rinkeby. Currently awaiting feedback: https://daotalk.org/t/seeking-feedback-omen-dispute-resolution-integration/1241/4