Demo page fetches script via http, instead of https

[valioDOTch]

The demo page at http://experiments.hertzen.com/jsfeedback/

fetches
http://html2canvas.appspot.com/query?url=https%3A%2F%2Fsecure.gravatar.com%2Favatar%2Fcd2699dedd7a4c7ac0c396739a7eeec9%3Fs%3D40&callback=html2canvas_0

This should be fetched via https://, not http://