polipo out of procd with respawn
add reSIProcate (SIP proxy and TURN server) package

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I've packaged the reSIProcate SIP stack (shared library), repro proxy
and reTurn, the ICE/STUN/TURN server.  Please find the Makefile and
related artifacts attached

Benefits to OpenWRT:

This provides a comprehensive platform for true federated VoIP from
OpenWRT, thanks to the following:
- - repro has a built-in web interface and no database dependency, so it
highly suitable for a router
- - repro provides strong mutual TLS authentication
- - reTurn provides robust and efficient NAT traversal for RTP streams

Dependencies:

This depends on my previous patches today, for building the C++
support for db47, and also adding libasio package

Testing:

I've tested the binaries on a TP-Link TL-WR1043ND with 32MB RAM and
8MB flash.  This seems to be the bare minimum amount of flash for the
combination of reSIProcate + openssl + libdb + other dependencies
http://wiki.openwrt.org/toh/tp-link/tl-wr1043nd

More info on reSIProcate:

  http://www.resiprocate.org/

and a quick start HowTo guide for federated VoIP with reSIProcte:

  http://www.opentelecoms.org/federated-voip-quick-start-howto
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