Second demo file (JS to CFML flow)
Rewrote getUserAccessToken according to the latest PHP realease of the PHP-Facebook SDK (v3 branch), removed the checks for "nearly" expired tokens from getUserAccessToken (among other things).

Also: changed exchangeAccessToken to set the relevant information into the persistent scope from within the function so that exchangeAccessToken can be called externally.
Testfile dumping and outputting various things for debugging purposes, don't use for any actual example, please.