Markdown parsing is done by Kramdown now instead of Redcarpet.
Redcarpet does not parse inline HTML tags properly. Syntax
highlighting comes free with Kramdown in the form of Coderay gem.

The previous commit's generated html files were error prone. These are
due to improper parsing of Redcarpet gem and because of errors in
Readmes which have been corrected now.
deleted book.html and changes.txt since they are now linked