Render Google Analytics snippet in footer

Render Google Analytics tracking code in footer before the closing body tag, as suggested by Google:

> This tracking code snippet should be included in your site's pages so that it appears at the bottom of the page's HTML (or generated-HTML) structure, before the closing `<body>` tag.

From: https://developers.google.com/analytics/devguides/collection/gajs/gaTrackingOverview