Enabled Billing Plans and Agreements APIs

- Added API Classes, Samples, and Tests
- Updated Functional Tests
- Updated Documentation with new SDK Name
- Updated Few Samples to use newer nicer result page

tests/bootstrap.php

@@ -5,4 +5,4 @@ $loader = require dirname(__DIR__) . '/vendor/autoload.php';
 $loader->add('PayPal\\Test', __DIR__);
 if (!defined("PP_CONFIG_PATH")) {
     define("PP_CONFIG_PATH", __DIR__);
-}
+}