This demo shows how to make your canvas and renderer fullscreen, ie setting resolution to the entire size of the page.
Combine this with JS `element.requestFullscreen()` to get a complete fullscreen experience (you can hit F11 on chrome to see how it looks like).
The following will make the renderer and cavas size cover the entire HTML doc.
// note: its ok to call this every frame. it won't do anything if nothing changed.
Shaku.gfx.maximizeCanvasSize();