Remove unused code.  Fix site saving/loading in config.
Remove oily_png/chunky_png dependcy, actually change Archive::is_valid? to valid?, and change AnimatedGIF::is_animated? to animated?.
Added a fix for animated gifs that have a delay of 1 or 0.
Added download speed to the progress message when downloading a booru
image.  Fixed Booru::Image#free from not killing the download thread.
Fix a couple exceptions from causing a crash when exiting.
Follow the aniated gif spec correctly, "The clock starts ticking
immediately after the graphic is rendered."  Clear booru image
download message as soon as it is done downloading.
Fix redirected downloads.