2.1.5
==================

 * flawless use of latest ngrok 2.1.1
 * major subdomain [issue](https://github.com/bubenshchykov/ngrok/issues/34) fixed
 * specs covering 3 groups of use: without authtoken, with free authtoken and with paid authtoken
 * breaking: env var for changing ngrok cdn renamed to NGROK_CDN_URL, path to bins changed too