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

src/GeoIP2/Exception/GenericException.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace GeoIP2\Exception;
+
+class GenericException extends \Exception
+{
+}

src/GeoIP2/Exception/HttpException.php

@@ -4,11 +4,13 @@ namespace GeoIP2\Exception;
 
 class HttpException extends \Exception
 {
+  public $code;
 
   public function __construct($message, $code, $uri,
                               Exception $previous = null)
   {
-    parent::__construct($message, $code, $previous);
+    $this->code = $code;
+    parent::__construct($message, null, $previous);
   }
 
 }

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);
+  }
+
+}