code: function uuid() {
          var base = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx';
          var result = base.replace(/[xy]/g, function (char) {
              var random = cryptoRandom16();
              var result = char == 'x' ? random : (random & 0x3 | 0x8);
              return result.toString(16);
          });
          return result;
      }
docs: Generates a UUID.
  Based on: http://stackoverflow.com/questions/105034/create-guid-uuid-in-javascript