XHR Cross Domain Problems in fastSync

[shaglama]

fastSync uses XmlHttpRequest to load files asynchronously and then runs them in the correct order as they finish downloading. It works great with files on the same domain and also with files from domains with appropriate "Access-Control-Allow-Origin" headers sent from server. However, resources on other domains without these headers cannot be downloaded as it violates same origin security policy of browsers. This issue does not seem to affect sync or asyn mode loading, probably because they load files by appending a script tag with the src attribute instead of loading the file and then adding its contents to a script tag as fastSync does.