Add method in Projects Class to get project issues

Author: omarlopesino

lib/Gitlab/Api/Projects.php

@@ -358,6 +358,14 @@ public function hook($project_id, $hook_id)
         return $this->get($this->getProjectPath($project_id, 'hooks/'.$this->encodePath($hook_id)));
     }
 
+    /**
+     * @param int $project_id
+     * @return mixed
+     */
+    public function issues($project_id, $parameters = array())
+    {
+        return $this->get($this->getProjectPath($project_id, 'issues'), $parameters);
+    }
     /**
      * @param int $project_id
      * @param string $url