Refactoring chunk logic.
Don't prepend filename in href if target is in the same chunk as source link node.
Cleaning up comments.
Bug fixes.
Put values for index-letter translate() normalization into variables to make code cleaner and easier to read.
Use <ul>/<li> markup for index instead of <dl>/<dt>/<dd> markup.
Merge pull request #56 from oreillymedia/htmlbook-xsl

Refactoring and minor improvements