Deploy FTE as a pluggable transport in PTTBBs

This is the ticket to organize the deployment of FTE as a new pluggable transport in PTTBBs.

Kevin posted a release announcement here: https://lists.torproject.org/pipermail/tor-dev/2013-December/005929.html

We need to review and audit the code before we deploy this. Then we need to include it in our next PTTBBs.