Stab at working around PEP 446 in Python 3.4.

Still doesn't make the failing test pass. :(
Fix the remaining failing test on Python 3.4

zdrun.py gets unhappy if it is spawned with no open file descriptors: it
creates a master socket as fd 1 and then proptly os.dup2's it out of
existence with the transcript pipe.
Remove the weird ../ZConfig develop from buildout.cfg
Merge branch 'python3.4-pep446'
Note explicit support for Python 3.4.