move toxml to a consistent place (after __unicode__) in every class
move toxml to a consistent place (after __unicode__) in every class

--HG--
extra : convert_revision : svn%3Aacbfec75-9323-0410-a652-858a13e371e0/trunk%40468

html5lib/html5lib-python,ordbogen/html5lib-python,dstufft/html5lib-python,dstufft/html5lib-python,mgilson/html5lib-python,dstufft/html5lib-python,ordbogen/html5lib-python,mgilson/html5lib-python,mindw/html5lib-python,alex/html5lib-python,mindw/html5lib-python,mgilson/html5lib-python,ordbogen/html5lib-python,alex/html5lib-python,html5lib/html5lib-python,alex/html5lib-python,gsnedders/html5lib-python,mindw/html5lib-python,gsnedders/html5lib-python,html5lib/html5lib-python