Updated todos
Merge pull request #57 from oreillymedia/xmlschema

Tweak to schema import for XML namespace to make xmllint happier.
Bug fix for $book-language handling.
Bug fix for $localizations-file handling.
Merge pull request #58 from oreillymedia/htmlbook-xsl

Bug fixes for handling of localization parameters
Fixed bug in handling of $embedded.fonts.list param that required there to be a newline at end of the list.
Merge pull request #59 from oreillymedia/htmlbook-xsl

Fixed bug in handling of $embedded.fonts.list param
ToDo note for XREF gen.
Support for new param $generate.root.chunk that lets you decide whether or not to generate a root chunk (i.e., index.html)
Fixed bug in full-output-filename logic, and revised to accommodate new $generate.root.chunk param
Revised EPUB handling to accommodate new generate.root.chunk param.
Actually generation order does not matter here, as logic is now written.
Merge pull request #60 from oreillymedia/htmlbook-xsl

Better handling of EPUB frontmatter generation
Added handling for $html4.structural.elements parameter that lets you toggle on/off whether to convert <section>/<figure> to <div> for HTML4 compatibility.
Fix typo in predicate.
Fixing typos in attribute value specifications.
Special handling for figure, if converting to <div> for backward compatibility.
Renaming idgen.xsl to elements.xsl, to reflect usage as all-purpose element postprocessor.
Handling for figcaption in HTML4 compatibility mode.
Removing inaccurate comment.