Update the canvas.js file from the repository

[mnisvdn]

I found out the canvas.js file relies on old and broken svg parser.
See for example #18.

And still after fixing the reference/syntax errors, the polyfill results is bad (paths are not properly respected, etc.).

When using canvasv5.js + svgpath.js together, this polyfill works as expected.
When coming on this repo it's not clear which file should be used if we do not want to rely on bower to get the file, and even the code snippet tells us to rely on canvas.js.
To avoid frustration just update the canvas.js with the latest svg parser.

Br.