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 stacks are just in demo components. I'm not putting a dependency here, I'm giving the option of specifying to the directive which stack it should use. Note the

`var notifyStack = scope.notifyStack || 'page';`

at the top of the `link` function