Improve Instant Update to disallow customer from purchasing during EC if shipping is not available to order shipping address
Fix tax calculation in order total
Add additional order total values (eg, discounts) to the line items
Set cheapest shipping as the selected shipping option in the session
Ignore ot_tax order total module in the line items
Merge pull request #61 from haraldpdl/paypal_express

Add additional order totals as line items (eg, discounts); Stop EC flow if Instant Update does not allow shipping to customer shipping address