Support for parsing existing CSS file

[Jeroen8]

It would be very nice if the css sprite generator could be used to point to a live website and let it parse the existing CSS file on the images used like buttons, logo's, etc.. -> use this information to download the images -> generate sprite and create an updated CSS files using the sprite instead of separate images.

This would be a huge improvement. CSS sprites are typically used to speedup existing websites. If this tool is able to parse existing CSS files, retrieve the images, create the sprite and a new CSS file this can help a lot of people to improve their existing website.