Try parsing result on completion of AJAX request
Try parsing result on completion of AJAX request

If it is unparsable, can safely assume we're dealing
with an error, and simply invoke doneLoading without
the 'Success' parameter set.

While here switch HTML5 regex to positive pattern (fixes
bug where certain control chars were slipping through).

jm-janzen/EC2-facer,jm-janzen/EC2-facer,jm-janzen/EC2-facer