Merge pull request #10 from oreillymedia/sanders

Additional handling for HTML wrappers
Adding handling for equation, informalequation, and caution; Adding descriptive comment
Removing handling for blocks nested in paras, which duplicated unwrapblocks.xsl
Merge pull request #11 from jlhosman/master

Removing duplicate handling for blocks nested in paras from db2htmlbook; adding handling to unwrapblocks for equation, informalequation, and caution
Preserve whitespace on all elements. Fixed bug with attribute propagation.