windows fix: do not parse dep as an url

If you parse an absolute dependency with `url.parse()` on windows, this happens:
```shell
C%5font.svg
# Really should be -> C:\fonts.svg
# Missing`:` and escaped `\`
```

I don't think it really needs parsing, a simple `.split()` works. ([cases](http://jsfiddle.net/oj63hq1p/1/))