Generate a v4 UUID, with seeding

generateUUID.js

// Source:
// http://stackoverflow.com/a/2117523 and
// http://stackoverflow.com/a/8809472
function generateUUID() {
   var d = new Date().getTime();
   var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
      var r = (d + Math.random()*16)%16 | 0;
      d = Math.floor(d/16);
      return (c == 'x' ? r : (r&0x7|0x8)).toString(16);
   });
   return uuid;
};