My REXML::Element.to_ncr (and REXML::Element.to_utf8) is horribly slow. For long documents, it proves more efficient to serialize to a string, apply String.to_ncr (or String.to_utf8) and then Sanitize the string.
In preparation for adding new tests, let's fix the existing ones.
3 Unit tests and one Functional test still fail.
* Two unit tests are bugs in xhtmldiff
* One is a bug in Maruku
* A file upload functional test fails, for reasons that escape me.
