Introduced common exception superclass

CloudObjects/SDK/WebAPI/Exceptions/OAuthFlowException.php

@@ -6,9 +6,11 @@
  
 namespace CloudObjects\SDK\WebAPI\Exceptions;
 
+use CloudObjects\SDK\Exceptions\SDKException;
+
 /**
  * An Exception that is thrown when an an OAuth flow failed.
  */
-class OAuthFlowException extends \Exception {
+class OAuthFlowException extends SDKException {
 
 }