add http client configuration in service; close frostealth#29

src/Service.php

@@ -45,6 +45,8 @@ class Service extends Component implements ServiceInterface
      * Initializes the object.
      * This method is invoked at the end of the constructor after the object is initialized with the
      * given configuration.
+     *
+     * @throws InvalidConfigException
      */
     public function init()
     {
@@ -150,6 +152,14 @@ public function setDebug($debug)
         $this->clientConfig['debug'] = $debug;
     }
 
+    /**
+     * @param array $options
+     */
+    public function setHttpOptions(array $options)
+    {
+        $this->clientConfig['http'] = $options;
+    }
+
     /**
      * @param string|array|object $resolver
      */