Releases for UC PayGate

Applied patch in #682108
-Fix string in IF statement Production >> production
-Added ability to set failed return URL
Backport from D7
-Added Google analytics reporting
-Added translation ($conf) for payment method title and checkout button.

-Added check_plain to various token replacement variables.

Fixed syntax errors reported and patched by Gomez_in_the_South #867866: Errors when card declined

Final release for production

Minor readme fix.
fixed: Successful payment did not clear balance.