Webservice client unit tests and fixes for bugs discovered while creating them

src/GeoIP2/Exception/WebserviceException.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace GeoIP2\Exception;
+
+class WebserviceException extends HttpException
+{
+  public $httpStatus;
+
+  public function __construct($message, $code, $httpStatus, $uri,
+                              Exception $previous = null)
+  {
+    $this->httpStatus = $httpStatus;
+    parent::__construct($message, $code, $uri, $previous);
+  }
+
+}