Contacts: Properly escape commas and semi-colons.

Conflicts:
	contacts/appinfo/app.php
Revert "Contacts: Properly escape commas and semi-colons."

This reverts commit 4176befe05ee72d472ebbbb3a5b424db185809c6.
Contacts: Use OCP\Util::maxUploadFilesize('/'). Fixes #756