Adding some more commandline options to the launch script.
Filling out the code to actually render HTML which has been passed to
the service. I had some trouble at first figuring out how to get the
page.render() call to wait until the page had finished loading, but I
figured it out the right hook eventually.
Still need to tweak the script to make it reduce the result to thumbnail
size and return the result as a image/jpg response to the POST request.