Introduced common exception superclass

CloudObjects/SDK/Exceptions/InvalidObjectConfigurationException.php

@@ -10,6 +10,6 @@ namespace CloudObjects\SDK\Exceptions;
  * An Exception that is thrown when an object's configuration
  * doesn't match the client's expectations.
  */
-class InvalidObjectConfigurationException extends \Exception {
+class InvalidObjectConfigurationException extends SDKException {
 
 }