This update contains lots of bug fixes and new features:
Now you can choose your own set of wallpaper images to use (see the README for details)
Added an option to start program when Windows boots in system tray menu
Fixed bug where program crashed if user set location before ZIP file finished downloading
Fixed bug where wallpaper fit (stretched, centered, tiled, etc.) was reset whenever image updated
Fixed memory leak which reduces memory usage by about 40MB
Error info is now written to log file, so if the program crashes there is useful information to report