Hold jquery ready event until order data has been pushed through

There is a five second timeout for waiting for the push to complete. If
the push isn't completed in five seconds, the jquery ready event is
fired anyway.
Hide the PayPal submit button via jQuery

So that the user won't click it and submit the form before Nosto push
request has succeeded.
Merge pull request #5 from Nosto/bug/#3-fixPaypalConfirmation

Fix the order-confirmation page when Paypal is used to pay