Updated the class to use TLSv1 as Paypal dropped support for SSLv3

See: http://stackoverflow.com/questions/26378351/error1408f10bssl-routinesssl3-get-recordwrong-version-number-paypal-maybe
More info on the POODLE vulnerability here:
https://security.stackexchange.com/questions/70719/ssl3-poodle-vulnerability