Rasterize canvas image
Rasterize canvas image

Get a .png image of the current drawing surface.

Fixes #44

DDMAL/Neon.js,avorio/Neon.js,DDMAL/Neon.js,avorio/Neon.js,avorio/Neon.js,DDMAL/Neon.js,DDMAL/Neon.js,avorio/Neon.js