src/Sonic/Helper.php
private function dot_extensions()
    {
        $extensions = $this->app['settings']['sonic.content_ext'];

        foreach ($extensions as $extension) {
            $dotted_extensions[] = '.' . $extension;
        }

        return $dotted_extensions;
    }
private function dot_extensions()
    {
        $extensions = $this->app['settings']['sonic.content_ext'];

        foreach ($extensions as $extension) {
            $dotted_extensions[] = '.' . $extension;
        }

        return $dotted_extensions;
    }
Adds a '.' to each extension given

@return array