* Add loading indiciators for the revenue report.
* Improve accessibility, and fix up some documentation comments.
* Fix top border on mobile
* Add EmptyContent Component and revenue error/empty states. (https://github.com/woocommerce/woocommerce-admin/pull/348)
* Add EmptyContent Component and revenue error/empty states.
* Move relative image handling to ImageAsset, combine secondary and primary action rendering, add some missing isRequired proptypes, add empty error handling.
* Handle PR Feedback: Clean up button css, set a default for illustration, fix deprecation typo, some code cleanup.