let Aloha run in preview mode
workaround for XSLT1 to get valid xhtml output
depend on rhaptos.cnxmlutils so we don't have to copy the xsl file, use new transform to create html5 in iframe.
add back-conversion for html->cnxml
Pass utf-8 binary data to libxml2.
Add vim swap files to gitignore
support new media slideshare
Merge branch 'html5' of github.com:oerpub/oerpub.rhaptoslabs.cnxml2htmlpreview into html5
prepare html5 for aloha
Merge branch 'html5'