feat(rxAccountInfo): Add rxAccountInfo component

This component is Rackspace-specific for showing account info and
badges, but also serves as a useful example for how to use rxInfoPanel.

This also brings `resource-helpers.js` in (hat tip to @halkon) to help with mocking services in unit tests.
Should this be something associated with the component? Perhaps `accountInfoStack` or `rxAccountInfoStack`?

If this is going to be officially supported, we should talk about adding in the `notifications` into the page object to simplify interacting with these named stacks.