- Extracts common tracking data processing/validation code into the Track
class
- Refactors Clicks, Opens and View in Browser classes to enforce
subscriber id and token check
- Allows admin users to preview newsletters without tracking statistics
- converted save and setStatus method of Newsletters endpoint
- updated pause/resume mixin for notification & welcome listings
- use 'newsletter_id' instead of 'id' in SendingQueue endpoint (less confusing)
- added NOT_FOUND constant to APIError
- fixed unit test for Newsletters endpoint save and added test for setStatus
- (re)Added Endpoints folder to both API and Router
- fixed syntax in namespaces
- xhr.responseJSON is returned to the fail()
- fixed Router endpoints (view in browser, cron,...)
