Added `svgpathSync`

Usage:

```
require('qr-image').svgpathSync('Hello World!');
```

Returns:

```
{ d: 'M1 1h7v7h-7zM12 1h1v3h1v2h-1v1h-1v2h-2v-1h1v-1h-1v-1h-1v-1h2v1h1v-2h-2v-1h1v-1h1zM15 1h7v7h-7zM2 2v5h5v-5zM9 2h1v1h-1zM16 2v5h5v-5zM3 3h3v3h-3zM17 3h3v3h-3zM9 7h1v1h-1zM13 7h1v1h-1zM1 9h1v1h1v-1h1v1h1v-1h1v1h1v1h-3v1h-1v2h-1v-2h-1zM7 9h1v1h-1zM13 9h1v1h-1zM17 9h1v2h2v-2h1v1h1v2h-1v1h-1v-1h-2v2h-2v-1h1v-1h-1v-1h-1v-1h2zM12 10h1v2h1v1h-1v2h-1v-2h-2v-1h-1v-1h3zM7 11h1v1h-1zM14 11h1v1h-1zM6 12h1v1h1v1h-4v-1h2zM8 12h1v1h-1zM14 13h1v2h-1zM9 14h2v1h-2zM19 14h2v1h1v1h-1v3h-1v1h-1v-2h1v-2h-1zM1 15h7v7h-7zM11 15h1v3h1v-1h1v3h-1v-1h-1v1h-1v-1h-1v-1h1v-1h-1v-1h1zM13 15h1v1h-1zM16 15h2v1h-1v1h-1zM2 16v5h5v-5zM3 17h3v3h-3zM9 17h1v1h-1zM17 17h1v4h-1v-2h-1v1h-1v-2h2zM9 19h1v1h-1zM21 19h1v1h-1zM10 20h1v1h-1zM12 20h1v1h1v1h-2zM20 20h1v1h1v1h-2zM9 21h1v1h-1zM16 21h1v1h-1z',
  size: 23 }
```