Reformat code.
Check if any calendar models was found.
Bump version. Master is now for Contao 3.3.
Add minimum-stability and prefer-stable to composer.json.
Use the events date from the event object.
Merge branch 'master' into contao-2.11

Conflicts:
	composer.json
	src/ContaoCommunityAlliance/Contao/Bindings/Subscribers/CalendarSubscriber.php