Merge pull request #28 from oreillymedia/sarah

Removing class="sidebar" attribute, as only data-type is needed
adding passthrough tests, and improving passthrough handling in standalone conversion script
Merge pull request #29 from oreillymedia/sarah-passthrough

adding tests, and improving passthrough handling in standalone conversion script
Merge pull request #30 from oreillymedia/sarah

adding better handling for partintro divs
making sure htmlbook-autogen templates match htmlbook templates, except for document template