Minor whitespace cleanup.
Added current section name widget.

You can stick some arbitrary piece of haml in a layout or something that
looks like this:

  %h2{:class => 'current-section'}
    = section_name

and it'll render the version name as specified like this in the
"versions" section of the config:

  couchbase-sdk-c:
    name: "Sea SDK"     # <-- the section name
    versions:
      - 2.0
      - 1.0