For now update travis to just use Ruby 2.1.1
Clean up HTML and CSS.
Add tests for helper methods.

First pass. All tests passing and majority are tested. Just need to
validate the paginate_previous? and paginate_next? methods.
Add passing test for Post.render that it returns cached html.
Avoid nil check in paginate_next? by using Array(value)

Better to use Array() than to_a since Object.new.to_a will raise an
undefined error.
http://avdi.org/talks/confident-code-railsconf-2011/
Add passing tests for paginate_next? and paginate_previous? methods.