Mac OS X pluggable transports bundles need argparse for Python 2.6 and earlier

pyobfsproxy doesn't work in the 2.4.11-alpha-1 bundles because argparse.py is missing. Looking at the bundle-macosx.txt instructions, it appears we are also missing the commands to copy at least twisted and zope too.

We need to add these copy commands to the bundle instructions, build new bundles, test them on a non-development machine, and publish the new bundles.