createRepo(options, cb) {
      return this._request('POST', '/user/repos', options, cb);
   }
Create a new repository for the currently authenticated user
@see https://developer.github.com/v3/repos/#create
@param {object} options - the repository definition
@param {Requestable.callback} [cb] - will receive the API response
@return {Promise} - the promise for the http request