Crawler code
===
Crawls http://wallpaperswide.com for wallpapers of a specific resolution.
Usage
To crawl the mac wallpaper at http://wallpaperswide.com/mac-desktop-wallpapers.html remove the ".html" from the end of the url and set that as the start_url in the Spider object, then use the run method:
spider = Spider('http://wallpaperswide.com/mac-desktop-wallpapers')
spider.run()
The images will be saved to images/mac-desktop-wallpapers/ folder.