v0.1.0.1

This small change allows other elements (text, whatever) to be added to the webpage that the demo is running in, without breaking the demo.

Other stuff on the page confuses the canvas-sizing function (which is designed to try filling the screen) and can sometimes cause it to produce a tiny, unusable drawing canvas. This update fixes that simply by adding a reasonable(?) minimum canvas-height to the function.

This should make the demo more usable in really tiny browser windows as well, if anyone was hoping to use it that way.

v0.1.0.0

Should be feature-complete to the original reference implementation. Let me know if anything is broken!