Merge pull request #1 from oreillymedia/nellie_formats

Adding css for epub, mobi, and html, fixes #AT-198 and #AT-233
changing layout
Merge pull request #3 from oreillymedia/layout_fixes

changing layout
<meta/> tag must be self-closing for well-formed XHTML.
Merge pull request #4 from oreillymedia/sanders

<meta/> tag must be self-closing for well-formed XHTML.
fixing head