Rails 3.1 upgrade notes (clean up after upgrade)

[professor]

What follows are a list of things I need to do when we've pushed your code into production for the real system.

When done with the upgrade

a) Remove these pages

http://whiteboard.sv.cmu.edu/pages/google_apps.yml
http://whiteboard.sv.cmu.edu/pages/amazon_s3.yml

b) Update travis.yml

c) Remove old production environment variables, google, s3