Issue 6

This change addresses https://github.com/Wikia/vignette-js/issues/6
Array.push can take more arguments:
```
url.push(
'/x-offset/' + sizing.xOffset1,
'/y-offset/' + sizing.yOffset1,
'/window-width/' + (sizing.xOffset2 - sizing.xOffset1)
'/window-height/' + (sizing.yOffset2 - sizing.yOffset1)
);
```