Trigger typeahead:selected on selection.
Trigger typeahead:opened and typeahead:closed.
Trigger typeahead:initialized.
Merge branch '68-trigger-custom-events' of git://github.com/jharding/typeahead.js into integration-0.9.0

Conflicts:
	src/dataset.js
	src/dropdown_view.js
	test/dropdown_view_spec.js
	test/playground.html