[BREAKING] change: Update service initializer and delete deprecated

[AmilKey]

fixes #80 #60

add support for Ember.inject.service for a new Ember's versions

If you need access to notification-messages service, inject it as a service:

export default Ember.Controller.extend({
  notifications: Ember.inject.service('notification-messages'),
});

[AmilKey]

@ynnoj restart tests, plz

[ynnoj]

@mansona Mind taking a look at this?

[maschwenk]

Any chance this will be merged soon?