Enabled EC Parameters support

- Updated Api to enabled EC Parameters
- Updated Tests
- Updated Logging Manager
- Added a feature to do validation on accessors.

lib/PayPal/Core/PPHttpConnection.php

@@ -45,7 +45,7 @@ class PPHttpConnection
             throw new PPConfigurationException("Curl module is not available on this system");
         }
         $this->httpConfig = $httpConfig;
-        $this->logger = new PPLoggingManager(__CLASS__, $config);
+        $this->logger = PPLoggingManager::getInstance(__CLASS__);
     }
 
     /**