Fix: Only print Google Analytics scripts on transaction results footer

We weren't making use of the $display_to_screen variable here when we should have been.  It was causing issues where transaction_results() would be called on order status changes, triggering this output when it was inappropriate.
Cart widget missing closing </div> tag. Fixes #97.
- passsing the post_id through

Seems silly that WordPress allows a post_id in get_the_title and when
WPEC provides it's own function it doesn' allow the parameter. In
general we should be passing the params that WordPress expects unless
it's retarded.