HTML5 based motion detection

Sends images from a device (index.html) to a viewer (viewer.html) over websockets when motion is detected.

Uses WebRTC getUserMedia(), <video>, <canvas>, Node.js and Socket.io

Hacked together quickly for a demo at #screens12. Two things to note at the moment:

1. The node server does serve up index.html or viewer.html
2. There are three absolute URLS in index.html, viewer.html and index.js that you will need to change.

This will all be cleaned up into a tidy node process very soon. thanks :)