Background image

[jayay]

Hello. The project has become very nice.
I'm still missing the integration of a big background image moving around when going through the slides (like on prezi).
Maybe we collect ideas where we'll put the upload button in the UI and discuss whether the images got to be accessible for everyone or just a single person.
At least we (and I) should know if it's already feasible with impress.js.

Thank you!