Rename  Snow.py -> snow.pyw.
Refactored to expose knobs, add a background and use more detailed animation.
Optimize to render flakes once then blit.
Added manual anti-aliasing.
Slightly optimized anti-aliasing.
Minor polish.
Automatically resize to background image size.
Add foreground image.
Remove ugliness warning in readme.
Merge pull request #1 from max99x/master

Fun with snow