document some types
no longer need Test::DescribeMe
More type descriptions
Support XSD 1.1 features for datetimes: explicitTimezone facet, and DateTimeStamp type
YearMonthDuration and DayTimeDuration
assertion facet
document support for DateTimeStamp, YearMonthDuration and DayTimeDuration
bugfix for dt types
test the explicitTimezone facet
allow assertions to operate on $_; test assertions