Should switch to new API

There's a new API that's available for some (but not ALL) services: http://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/price-changes.html.  This script should slowly migrate to that set of APIs

Here's a module that's already using it: https://github.com/lashex/pyutu

We can't switch to that yet since this module also covers services that aren't available from the new API.
