public function addLocation($location)
    {
        $loader = new \Mustache_Loader_FilesystemLoader($location);
        if ($this->mustache->getLoader() instanceof \Mustache_Loader_CascadingLoader) {
            $this->mustache->getLoader()->addLoader( $loader);
        } else {
            $loaders = [$this->mustache->getLoader(), $loader];
            $this->mustache->setLoader(new \Mustache_Loader_CascadingLoader($loaders));
        }
        return $this;
    }