Move gh-pages branch files into /docs and add test files

- Jekyll ignore `/docs` and `/test` folders when using from root
- Update Staticman config to point to correct branch and data file location
- Replace `{{ base_path }}` references with `absolute_url` filter
- Update documentation

docs/_includes/head.html

@@ -0,0 +1,19 @@
+<meta charset="utf-8">
+
+{% include seo.html %}
+
+<link href="{% if site.atom_feed.path %}{{ site.atom_feed.path }}{% else %}{{ '/feed.xml' | absolute_url }}{% endif %}" type="application/atom+xml" rel="alternate" title="{{ site.title }} Feed">
+
+<!-- http://t.co/dKP3o1e -->
+<meta name="HandheldFriendly" content="True">
+<meta name="MobileOptimized" content="320">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+<script>
+  document.documentElement.className = document.documentElement.className.replace(/\bno-js\b/g, '') + ' js ';
+</script>
+
+<!-- For all browsers -->
+<link rel="stylesheet" href="{{ '/assets/css/main.css' | absolute_url }}">
+
+<meta http-equiv="cleartype" content="on">