add google analytics

[MohoWu]

Hi,
Thanks for the theme. I'm wondering if it's simple to add the google analytics feature to the theme. It seems from this post that you only need to add a one-liner to the template file.

I added that line to the single.html file right before </body> like below

  {{ template "_internal/google_analytics.html" . }}
</body>

And I added the tracking ID in the config.toml file. But my google analytics page doesn't seem to record any traffic. Any ideas?