Allow whitespace around commas in point parsing

Per the SVG spec:

http://www.w3.org/TR/SVG/shapes.html#PointsBNF

This was failing when importing SVG files that had whitespace around the commas in the points string, like this

```
<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="1225" height="765" viewBox = " 0 0 1125 765" >
<!-- Front-->
<g transform="translate(22.5, 22.5) " >
<polygon points="0, 0 0, 360 360, 360 360, 0" />
</g>
</svg>
```

When pulled into the 'kitchen sink' demo, every other point value is NaN