code: function user_options (access_json) {
    return {
      headers: {
        'Authorization': 'token ' + access_json.access_token,
        'Accept': 'application/json',
        'User-Agent': 'hapi-auth-github' // a User-Agent is *REQUIRED*!!
      },
      hostname: process.env.GITHUB_API_HOSTNAME || 'api.github.com',
      method: 'GET',
      path: '/user',
      port: 443
    };
  }
docs: http request to get the profile of the person that just authenticated
  see: https://developer.github.com/v3/users/#get-the-authenticated-user
  @param {Object} access_json returned by GitHub OAuth access_token request.
  @returns {Object} data & headers we are sending to GitHub in our HTTP request