Khan/aws-config — pull request #3 by jnetterf (2014-03-24 18:54:04+00:00)
Title: Make install_exercise_icons idempotent & use Khan repo

Test Plan:
- Comment out all the "install_*" lines except for "install_exercise_icons"
- rm -rf ~/exercise-icons
- Run 'sh ./setup.sh'
- Run 'sh ./setup.sh' again