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

test/_posts/2016-02-24-welcome-to-jekyll.md

@@ -0,0 +1,29 @@
+---
+title:  "Welcome to Jekyll!"
+header:
+  teaser: "https://farm5.staticflickr.com/4076/4940499208_b79b77fb0a_z.jpg"
+categories: 
+  - Jekyll
+tags:
+  - update
+---
+
+You'll find this post in your `_posts` directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run `jekyll serve`, which launches a web server and auto-regenerates your site when a file is updated.
+
+To add new posts, simply add a file in the `_posts` directory that follows the convention `YYYY-MM-DD-name-of-post.ext` and includes the necessary front matter. Take a look at the source for this post to get an idea about how it works.
+
+Jekyll also offers powerful support for code snippets:
+
+```ruby
+def print_hi(name)
+  puts "Hi, #{name}"
+end
+print_hi('Tom')
+#=> prints 'Hi, Tom' to STDOUT.
+```
+
+Check out the [Jekyll docs][jekyll-docs] for more info on how to get the most out of Jekyll. File all bugs/feature requests at [Jekyll's GitHub repo][jekyll-gh]. If you have questions, you can ask them on [Jekyll Talk][jekyll-talk].
+
+[jekyll-docs]: http://jekyllrb.com/docs/home
+[jekyll-gh]:   https://github.com/jekyll/jekyll
+[jekyll-talk]: https://talk.jekyllrb.com/