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
There's no merge in this case (and `return Object` is not precise enough)

Should be something like:
```js
        /**
         * Configures the next view service. It is called when the active view
         * service change in the application with the new service in parameters
         * so that it's possible to configure it.
         * 
         *
         * @method setNextViewServiceParameters
         * @param {eZ.ViewService} newService the new view service to configure
         * @return {eZ.ViewService} the new view service
         */
```
```