The spinning wait icons by Andrew B. Davidson were taken from

http://www.andrewdavidson.com/articles/spinning-wait-icons/

The icons are copyrighted. As far as license goes, this is my understanding
from the above web site:

"These icons are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License."

Link to license: http://creativecommons.org/licenses/by-nc-sa/2.5/
