DRY callback reference leak tests
Check other easy callbacks for being properly decreferenced
Fix reference leaks of socket and timer callbacks on multi instances, fixes #182
Reimplement SSL serving with Python stdlib's ssl module.

SSL via CherryPy would fail on recent GNU userlands thusly:

error: (56, 'SSL read: error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number, errno 0')

Reported in #180 as well as for a while now by travis.
Merge pull request #189 from p-push/ssl-stdlib

Reimplement SSL serving with Python stdlib's ssl module.
Note removal of cherrypy dependency in changelog
Require nose 1.3.2+ as 1.3.1 is broken on python 3
Merge pull request #190 from p-push/travis

Require nose 1.3.2+ as 1.3.1 is broken on python 3