feature #863 Add sort and direction for fetching organizations repos (pgrimaud)

This PR was squashed before being merged into the 2.13.x-dev branch.

Discussion
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Hi,

It's possible to sort repositories of organizations here : https://developer.github.com/v3/repos/#list-organization-repositories.

I added `$sort` and `$direction` parameters after actual parameters to avoid BC.

Associated tests are updated too.

Commits
-------

5c3aee1 Add sort and direction for fetching organizations repos
6aa74fb Fix styleci
041af92 Set new parameters as null instead of default values
304bd19 Fix styleci

Author: Pierre Grimaud

lib/Github/Api/Notification.php

@@ -23,6 +23,7 @@ class Notification extends AbstractApi
      * @param bool          $includingRead
      * @param bool          $participating
      * @param DateTime|null $since
+     * @param DateTime|null $before
      *
      * @return array array of notifications
      */

lib/Github/Api/Organization.php

@@ -53,15 +53,27 @@ public function update($organization, array $params)
      * @param string $organization the user name
      * @param string $type         the type of repositories
      * @param int    $page         the page
+     * @param string $sort         sort by
+     * @param string $direction    direction of sort, asc or desc
      *
      * @return array the repositories
      */
-    public function repositories($organization, $type = 'all', $page = 1)
+    public function repositories($organization, $type = 'all', $page = 1, $sort = null, $direction = null)
     {
-        return $this->get('/orgs/'.rawurlencode($organization).'/repos', [
+        $parameters = [
             'type' => $type,
             'page' => $page,
-        ]);
+        ];
+
+        if ($sort !== null) {
+            $parameters['sort'] = $sort;
+        }
+
+        if ($direction !== null) {
+            $parameters['direction'] = $direction;
+        }
+
+        return $this->get('/orgs/'.rawurlencode($organization).'/repos', $parameters);
     }
 
     /**