Reformatting official HTMLBook specification as HTML5 content instead of AsciiDoc for better formatting.
Adding symlink pointing index.html at specification.html
Merge pull request #123 from oreillymedia/htmlbook-spec

Reformatting spec document in HTML5
Making specification.html the symlink instead of index.html
Adding additional EPUB references.
Merge pull request #124 from oreillymedia/gh-pages

Updates to spec document
Updating spec link.
Apply the change of original.