Add node.js version of Rendezvous server.

Add node.js version of Rendezvous server. This version uses memcache
for storing rendezvous data. It logs information from phones to a
CouchDB Database.

Change-Id: I2b76750681e20b8aea56c507a7727c33ca3c2987
Upgraded appengine jars from v1.6.2.1 to v1.7.6

Change-Id: I62df91577048aa8a76f79025cc84417c317237be