demo.js back. NOVA.loadPDF added.

demo.pdf shows an example on how to get some data to use in the scripts API.

NOVA.loadPDF function added. Was before in window.onload, so now can we load a pdf multiple times. Yaay!

We are now loading initially in demo.js in a winow.onload function.
cleanup
Merge pull request #1 from JohnTheDaniel/master

Demo.js back, NOVA.loadPDF added (instead if window.onload)