Author: Shamim Rezaie
MDL-69166 pg_paypal: Ability to connect to sandbox or live environment
http://git.moodle.org/gw?p=moodle.git;a=commit;h=330f492089bf13906f1f3fd1a44d02532d0058cd
http://github.com/moodle/moodle/commit/330f492089bf13906f1f3fd1a44d02532d0058cd
+ 4.0 en [environment,pg_paypal]
+ 4.0 en [environment_desc,pg_paypal]
+ 4.0 en [live,pg_paypal]
+ 4.0 en [sandbox,pg_paypal]