adding a slug parameter to the events collection to fetch just the event with that slug
search events by title
Handle case when stub doesn't exist
Handle when no events match the given title filter, pass in required and optional parameters
Merge branch 'dstockto-JOINDIN-346'
Merge branch 'master' of GitHub:joindin/joindin-api into dstockto-JOINDIN-277-events

Conflicts:
	src/controllers/EventsController.php
	src/models/EventMapper.php