Copy antlib.xml into jar file to fix issue #157
Make application/pdf the default content type for the CSS formatting step
Make failure to instantiate a requested extension function more obvious
Add a cx:version attribute to the p:validate-with-xml-schema step
to specify the schema version.
Remove bogus .orig and .rej files
Use URI.create instead of new URI (h/t to Björn Kautler)
Fix some exceptions.
Attempt to clean up some issues wrt content-type in p:data; maybe fix bug #154?