Use Ian Bicking's formencode xml_compare method for tests to avoid test failures on different platforms.
Declare formencode as a dependency to use xml_compare directly from formencode. No need to copy the code into our repo.
Replace inline HTML elements in style-script-quoting-1 test since xml_compare get confused by those elements.
Remove xmlns namespace declaration from esi test since xml_compare complains that this attribute is not allowed there.
Update CHANGES.
Merge pull request #29 from plone/fix-tests

Use formencode's xml_compare method to compare test results. This solves test failures on several systems.