Comment out 2nd demo instance
Consolidate CSS; remove unused CSS
LiterallyCanvas renders using multiple canvases

* LiterallyCanvas(containerEl, opts)
* LiterallyCanvas.repaint() -> LiterallyCanvas.repaintAllLayers()
* LiterallyCanvas.repaintLayer('main|background', dirty=(layer=='main'))
* All children of outermost element are obliterated after old canvas saved
Merge pull request #149 from irskep/finite-bounds

LiterallyCanvas renders using multiple canvases