Moved invoice number to payment request
Whitespace
Merge pull request #1 from everydayhero/sc_add_invnum

Add invoice number to the SetExpressCheckout payload
Added custom content field
Merge pull request #2 from everydayhero/sc_add_custom

Added custom content field
Added exchange rate support to payment response info
Merge remote-tracking branch 'everydayhero/master'

Conflicts:
	lib/paypal/payment/request.rb
Merge remote-tracking branch 'zunger/add-exchange-rate-to-response-info'