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v1.0 to v1.1 Changes

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Change 1.) Fixed the known error
------ If you return to the checkout page after logging in
and then do not select a billing address before processing your order on checkout_confirmation.php
the checkout_process.php will not work and it will just return you to your shopping cart until you select a billing address.
(FIXED)

Change 2.) Changed how when a returning customer is redirected when they click sign in on the checkout page
and logs in on the login page. This change will now take them back to the checkout.php page with all of their
information. other version the login button would take them to index.

Not full package - changes only

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