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.
The reason it's here is to support multiple account info boxes on a page, each pushing notifications to a different `<rx-notifications>` component.

But the only reason I have that anyway is to allow for multiple account info boxes on the demo page. We won't actually use multiple ones in real apps.

I'm open to suggestions for a different way to do it