[WIP] update mac configure script and add messaging about common port forwarding issue

update mac configure script and add messaging about port forwarding until we maybe use a better solution like how libtorrent does this, or RPC & UDP like this https://github.com/bmuller/rpcudp to avoid most port forwarding issues.
we could use the pip not in env/bin but virtualenv does that automatically. i don't see the point in trying to disable that behavior.  so yea you need pip before virtualenv if you don't have virtualenv.  there are some sketchy brew formulas but i wouldn't risk it.  anyway "brew install python" installs pip automatically too.  easy_install is not nearly as good as pip IMHO.