And add a few more tests.

Instead of just decoding Utf8, this will proxy requests to buffer.toString()
for other encodings. This makes for a simpler interface.

- Without this, recvMsg can be invoked before the event emitter gets a
  chance to run. In this case, recvMsg.fd will be overwritten and the
  original caller can end up emitting null.

Add callback param to listen() instead

- Adds new dgram module, for all data-gram type transports
- Supports both UDP client and servers
- Supports Unix Daemon sockets in DGRAM mode too (think syslog)
- Uses a shared Buffer and slices that as needed to be reasonably
  performant.
- One supplied test program so far, test-dgram-pingpong
- Passes test cases on osx 10.6 and ubuntu 9.10u

This fixes #169 by putting the require members onto the cwdRequire function
which is exposed to the repl scope.

The deprecation warning was broken, so clearly no one is using this thing.

- reference to OpenSSL
- note about http-parser

This is needed in case the provided socket is not the default 'tcp4' type
(i.e. and needs different read/write/etc methods). With this patch, one can
call listenFD(sock, 'unix') to bind to existing UNIX domain sockets.

Setting this environmental variable to a non-zero integer will start all
REPL interfaces without readline. For use with rlwrap.

For eventual large character support.