Upgrade Cherrypy to version 3.6.0

- Upgraded Cherrypy to version 3.6.0
- Don't pass unicode hostname to cherrypy (see cherrypy-issue #1285,
https://bitbucket.org/cherrypy/cherrypy/issue/1285/n-must-be-a-native-str-got-unicode)

Running on my homeserver for two days now, no problems so far.