- uptaded Subscriber & Segment routers' test
- moved add/remove segments logic to Subscriber::createOrUpdate
- fixed Router\Segments save not returning errors
- added -f flag to run unit test command in order to fail fast
- pass only id to "$endpoint->get($id)" in React forms instead of array
- updated routers according to the ->get($id) change
- refactored a bit the way form creation works
- added unit tests for Segments router
