v0.0.6

Code is now split into separate files, instead of all being in index.js

• Adds canvas capture mode, an experimental mode for transferring data directly from the canvas element, via the --canvas-mode command line option, or via config.canvasMode for Node.js
• Outputs the elapsed capture time, calculated from just before capturing frames begins to after it ends
• Removed the minimum 60fps call rate for requestAnimationFrame calls