Update CollectionTypeExtension.php

Replace the deprecated constant FormEvents::BIND by FormEvents::SUBMIT, renamed the callback function to onSubmit
Update CollectionOrderListener.php

Renamed the function onPostBind to onSubmit to match the replacement of the deprecated constant FormEvents::BIND to FormEvents::SUBMIT
Merge pull request #259 from sylvaincombes/master

Fix Issue #155 : replace deprecated constant