Add helper daemon for indirect URL registration.

Add a daemon which accepts RSA encrypted, base64 encoded
client addresses and registers them with the facilitator.
It is meant to be used by facilitator.cgi upon receiving
a registration through a GET request.
Add handling of URL registrations to facilitator.cgi.

Modify facilitator.cgi to accept client registrations
through HTTP GET requests. The addresses are encrypted
and base64 encoded, and are passed in using extra path
info of the form /reg/<address>. The registrations are
handed off to a daemon for precessing.
Add init script for facilitator-reg-url daemon.

Add an init script for facilitator-reg-url. I just
copied the one for facilitator-email-poller and
changed some variables. Also updates the Makefile
in /facilitator to copy the new init script.
Change facilitator-reg-url shebang to match other python programs.
Add helper program to print URL registrations.

Add a client-side helper program, flashproxy-reg-url,
to print out encrypted URLs that can be used to register
with a facilitator. The public key and facilitator are
hard coded into the script.
Add documentation for URL registrations.

Modify the facilitator howto to provide a short
explanation of URL registrations and give setup
instructions.
Use UTF-8 encoding for client registrations.

facilitator-reg-url was receiving registrations in UTF-32
encoding and passing them on verbatim to getaddrinfo(), which
caused it to return bogus results.
Add -f/--facilitator option to flashproxy-reg-url.
Some changes for uniformity.
Remove length limit on reg URLs.
Factor out output_status function.
Simplify some URL registration code.
Use status 204 (No content) after URL registration.
Catch errors in url_reg.

Like if facilitator-reg-url is not running.
Serial comma.
Change description of URL rendezvous method.

I don't want to mention any actual URL retrieval services here.
Whitespace.
Merge branch 'master' into url_reg

Conflicts:
	doc/facilitator-howto.txt
	facilitator/Makefile
Remove facilitator-reg-url, replaced by facilitator-reg-daemon.
Use put_reg_base64() for url registrations.

Use the put_reg_base64 function from the fac module to
register clients, instead connecting to the daemon directly
using sockets.