Adding before and after events
Re-named test event to test subscriber.
New event subscriber to call "before" and "after" controller methods.
Adding new BeforeAfterSubscriber to event dispatcher. Enabled HTTP Cache wrapper.
Updating routes. Hello/{lang} route accepts trailing slashes.
Moving after_controller event to be called right after the controller is called. Placing it after the catch blocks will generate problems if an exception is thrown before the controller is created and assign to the event.
Merge pull request #1 from sdphp/study-group-03

Study group 03