* WIP: Gives Admins the ability to delete invitations from /admin/invitations
* Refactors #destroy to properly delete invites, redirect, & display messages
* Adds additional flash message and makes existing messages more explicit
* Adds spec to test the deletion of invitations in admin/invitations
* First draft - all the big changes
* Changing some more references to 'internal'
* Relocate internal request tests to admin
* Relocate internal system tests to admin
* Fix trailing space
* Test fix
* Move queries from internal to admin
* Docs updates
* Rename internal stimuls controllers to admin (plus docs)
* Rename admin layout
* Fix routing after rebase
* Fixes for latest added admin interfaces
* Serviceworker ignore paths