Added helper methods for formatting the elements as HTML tags in HTML converter
Fixed bug with atx headers without header text
Mentioned that the coderay library must be installed for syntax highlighting to work
Background of main content now always white regardless of its height
Added Redcarpet to benchmark, benchmark must now be run manually for tests.page
Updated kramdown website

* Now using webgen 1.0.0 for generating the site
* Added two additional menus to the sidebar for documentation
  pages to make navigating between pages easier
Removed unused parameter in Converter::Toc#add_to_toc private method
Added new option link_defs for kramdown parser

This option allows to pre-define link definitions that can be used
by reference style links in the document.
Added webgen-tmp to gitignore
Updated release notes, version and homepage.
Fixed problems in Rakefile with rdoc 4.0.0.preview2 and webgen 1.0.0