Connexions/cnx-epub — pull request #16 by karenc (2014-05-02 10:05:21+00:00)
Title: Change code to not assume ".xhtml" for application/xhtml+xml

mimetypes.guess_extension can sometimes return ".xht", see

```
>>> mimetypes.guess_all_extensions('application/xhtml+xml')
['.xhtml', '.xht']
```

cnx-epub shouldn't break in case extension is ".xht"