PayPal Express Checkout IPN

[michael_s]

This update has following fixes:
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1. The IPN records in order comment always shown as "PayPal IPN Verified", no matter if it was a verified or invalid response, fixed.

2. cURL not working with ipn.php if it requires to go through a proxy server, fixed.

3. Irregular state name in the shipping address sent to PayPal was showing as PAYPAL_STATE, fixed.

4. Virtual order didn't send address to PayPal, so the sign-up form address fields were not pre-populated, fixed.

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After testing with PayPal live server, customers are sent back to store after they signed up, so this issue has been taken out from the Known Issues section in the install guide.
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If you have installed v0.1, just drop-in the files in the [new files] folder and replace existing files.

Full package.

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