Backwards compatibility fixup for currencies
* add 'currency' as an alias for 'name' when returning currency array
* fix some miscoding in the currency list handling for the paypal gateway
Merge pull request #1230 from JeffPyeBrook/pr-1229-paypal-currency-issues

Backwards compatibility fixup for currencies
add currency code as the array index for a currency array list to mainatin backwards compatibility
Merge pull request #1231 from JeffPyeBrook/pr-1229-paypal-currency-issues

Add currency code as array key to maintain backwards compatibility