First cut at converting to nokogiri
Remove REXML references in the doc parts
Remove REXML from the utilities, move them into the XMLCodec namespace and remove some useless functions
Remove REXML from subelements and move all users of XMLUtils to the right namespace
Remove the last usage of REXML from the stream parsers
Remove rcov as it doesn't work in 1.9
Use simplecov to do coverage reports
Ignore ~ files
Support ruby 1.9 instead of 1.8