Add Projects to Group Model and added to API so projects can be obtai…

…ned from API\Groups from within Model similar to how Members can be selected from with the Group model.

lib/Gitlab/Api/Groups.php

@@ -133,4 +133,18 @@ public function removeMember($group_id, $user_id)
     {
         return $this->delete('groups/'.$this->encodePath($group_id).'/members/'.$this->encodePath($user_id));
     }
+
+    /**
+     * @param $id
+     * @param int $page
+     * @param int $per_page
+     * @return mixed
+     */
+    public function projects($id, $page = 1, $per_page = self::PER_PAGE)
+    {
+        return $this->get('groups/'.$this->encodePath($id).'/projects', array(
+            'page' => $page,
+            'per_page' => $per_page
+        ));
+    }
 }

lib/Gitlab/Model/Group.php

@@ -125,4 +125,15 @@ public function removeMember($user_id)
 
         return true;
     }
+
+    /**
+     * @return Group
+     */
+    public function projects()
+    {
+
+        $data = $this->api('groups')->projects($this->id);
+
+        return Group::fromArray($this->getClient(),$data);
+    }
 }