* Styling for empty-state and splash-page
* Update shamir-flow language and trigger onError on non-400 error
* Add license terminated screen to unseal
* Add changelog
* add NavHeader component
* use NavHeader in SplashPage component and application.hbs
* let download button take a block
* add RadialProgress component
* use RadialProgress in ShamirFlow component
* style up the RadialProgress component
* update ember-basic-dropdown, ember-basic-dropdown-hover
* rework operation token generation workflow
* directly depend on ember-maybe-in-element
