Allow complete URL in get method

The get method always prepends the baseurl before the requests path.
A check was added to allow for full URLS (starting with baseurl), for following
pagination links.

Author: ramondelafuente

lib/Github/HttpClient/HttpClient.php

@@ -163,7 +163,9 @@ public function put($path, array $parameters = array(), array $headers = array()
      */
     public function request($path, array $parameters = array(), $httpMethod = 'GET', array $headers = array())
     {
-        $path = trim($this->options['base_url'].$path, '/');
+        if (0 !== strpos( $path, $this->options['base_url'] )) {
+            $path = trim($this->options['base_url'].$path, '/');
+        }
 
         $request = $this->createRequest($httpMethod, $path);
         $request->addHeaders($headers);