SSL setup tweaks

[dmyung]

I realize that this repo hasn't seen much activity (given that it's such a straightforward and useful management command), however, I updated the management command to use a later cherrypy ssl setup mechanism.

I added a check for cherrypy versions to retain compatibility for those who are pre 3.2.

Additionally, I added the option to use the ssl_certificate_chain to both older and newer implementations of cherrypy.