Instead of JSON encoding them, just rethrow promise errors since that
produces much cleaner error messages.

A promise will throw an exception unless an error handler is attached in the
same "tick" that the error is emitted. This is to avoid silent promise
failures.

Listeners attached with addCallback / addErrback will now be executed
right away if the promise has already fired.

The current implementation was bad and nobody is using it. Has a chance
of getting re-implemented by somebody who has an actual need for it.

This is a replacement for the common hack:

  setTimeout(cb, 0);

It's much more efficient.

With priorities. Will be used for process.nextLoop().

For some reason v8 doesn't include the frame with the syntax error in the
stack trace - so have to special case it.

Why? Because I have two versions of GnuTLS installed - one is old 2.0.X in
/usr and one is new 2.5.X in ~/local/gnutls. waf correctly finds that the
newer version, but because GNUTLS was behind other libraries in the
node.uselib -L/usr/lib was before -L/home/ryan/local/gnutls/lib in the
actual gcc command - hence getting link errors. WAF SUCKS, really.
I wish someone would invent a good build system that could avoid such
problems.

eof_symbol wasn't initialized until the first packet arrived.
In this case no packets arrive before the client closes the socket - eof.

Also make normalizeArray a bit more proper wrt handling dots when keepBlanks
is enabled. Fix indentation.

Should call eio_poll() when given a done_poll signal as well.

Bug report and test case by Kris Zyp <kriszyp@gmail.com>

Fixes \n problem that psanford <pms.mail@gmail.com> reported.

Oops. Last commit broke a few tests. Should work now!

Finally (hopefully) fix the issue that Felix reported. It's only appearing
on macintosh (test/mjsunit/test-eio-race3.js)

The trick/hack is to call eio_poll() again before reentering the event loop.

Additionally this commit implements a more complex method of calling
eio_poll(), occasionally dropping to an ev_idle watcher.

See also:
3f397728
http://lists.schmorp.de/pipermail/libev/2010q1/000855.html
http://groups.google.com/group/nodejs/browse_thread/thread/9f8db11c792a68bb/a89705f68971f53c

Reverts the change to deps/libeio/eio.c added in
04dd2d51
It wasn't a bug, I was just using eio incorrectly.

See http://lists.schmorp.de/pipermail/libev/2010q1/000855.html