Generic request handler for returning a promise when requesting a url

helpers.js

/*
 * Internal: Convert the request for a url into a promise
 *
 * url - the String to fetch
 *
 * Example: return request('http://www.google.com')
 *
 * Returns a promise
 */
var request = function(url) {
  // Q-wrapped request function.
  // Returns request promise.
  var deferred = Q.defer();
  _request(url, function(e, r, b) {
    if (e) {
      deferred.reject(new Error(e));
    } else {
      deferred.resolve(b);
    }
  });
  return deferred.promise;
};