fetch daily bing.com home page image as wallpaper.
Usage of bingwp:
-copy
whether to print copyright info at bottom. (requires graphicsmagick)
-dir string
directory downloaded images are saved (default "/Users/yourname")
images are saved as yyyymmdd.jpg.
you may point to the directory where images are saved in system wallpaper settings.
you may setup running this program daily since bing.com home page is updated daily.