use nokogiri 1.5 for testing, which should work with ruby 1.8 and 1.9+
add bundler gemtasks
update to rspec 2.x
remove hard-coded paths to fixture directory
require 'time' before invoking Time.parse
don't hard-code generated fixture dates and sizes, which may change if they are regenerated.
only use hashery in ruby 1.8
argumenterror is only thrown under ruby 1.9+
bump to 1.3.0