Graphviz images broken on Ubuntu 14.04 with basic install

[gregelin]

Just tried installing and running on Ubuntu server. The graphviz images are incorrect.

Also, note it is important to configure cherrypy socket to make site available on IP address other than 127.0.0.1.

if __name__ == '__main__':
    conf = {
        '/': {
            'tools.sessions.on': True,
            'tools.staticdir.root': os.path.abspath(os.getcwd()),
            'tools.encode.on': True,
            'tools.encode.encoding': 'utf-8'
        },
        '/static': {
            'tools.staticdir.on': True,
            'tools.staticdir.dir': './public'
        },
        '/output': {
            'tools.staticdir.on': True,
            'tools.staticdir.dir': 'output'
        },
        '/assets': {
            'tools.staticdir.on': True,
            'tools.staticdir.dir': 'web/assets'
        }
    }
    cherrypy.config.update({'server.socket_host': '104.131.136.182'})
    cherrypy.quickstart(StringGenerator(), '/', conf)