EZS-26 - Implement redirection after a user finishes editing the content in the Content Edit form

https://jira.ez.no/browse/EZS-26

**Implemented:**
* [x] Custom redirection on publish action,
* [x] Custom redirection on close action,
* [x] Custom redirection on discard action,
* [x] Method to set next view service params when switching active view services.
* [x] JS unit tests
so now `newService === oldService === Service` ? that's weird. You should have 2 different mocks (`newService` and `oldService`) and `Service` is actually useless.