Merge pull request #93 from oreillymedia/samples

Fixed validity error in htmlbook.html sample; subtitles must have data-type
Refinements to cover handling.
Merge pull request #94 from oreillymedia/htmlbook-xsl

Refinements to cover handling
Turning off $html4.structural.elements by default in epub.xsl
Modifying main h:nav template so it can be used as a named template as well.
Go ahead and allow TOC generation for every <nav data-type="toc"> in the content? (Do not really see a compelling argument to restrict to just the first <nav>)
Adding $scope param for specifying the scope at which a TOC will be generated (from root, from Chapter, etc.)
Support for TOC generation in process-chunk-wrapper mode.
Merge pull request #95 from oreillymedia/chunk-wrapper

Refined TOC generation handling and support for TOC generation in chunk-wrapper mode
Turn off generation of border <div>s for figures by default.
Merge pull request #96 from oreillymedia/htmlbook-xsl

Turn off generation of border <div>s for figures by default.
Handling for hard-pagebreak PI, and corresponding tests.
Merge pull request #99 from oreillymedia/pis

Handling for pagebreak PI, and corresponding tests.
Handling for PDF bookmarks and xspec tests.
Merge pull request #100 from oreillymedia/pdf-bookmarks

Handling for PDF bookmarks and xspec tests
Refactoring for heading processing for PDF bookmarks.
Fixed bug in selection of child nodes for headings in title.markup mode (used //node() instead of /node()
Merge pull request #101 from oreillymedia/tocgen

Fixed bug in selection of child nodes for headings in "title.markup" mode
Merge branch 'master' of github.com:oreillymedia/HTMLBook into pdf-bookmarks
Moving "process-headings" template to common.xsl