as suggested by Bluebie.

- Link libeio to pthread.
- Add -D_GNU_SOURCE to libeio wscript.

Now supports:
- command options: .help, .break, .clear, .exit
- local vars and global functions
- ability to print 0, false and ""
- when value is a function, prints [Function]
- when object is circular, prints [Circular Object] instead of throwing an error

Now you can require("/repl.js") in your server to be able to examine it
while it's running.

...after seeing http://lionet.livejournal.com/42016.html

This became an apparent problem when adding setNoDelay because the command
was ignored if issued during the "connection" event.

Asciidoc does not seem to support including custom JS, so this patch is a hack
for toc.js to dynamically include the needed CSS / JS. It should be ok unless
somebody has a better approach ...

This is because it would call the javascript initializer which executed
Promise::New, and then it would rewrap the handle. Instead I make an
explicit inheritance from EIOPromise to Promise.

This seems to fix a memory leak which was reported by Ray Morgan:
http://groups.google.com/group/nodejs/browse_thread/thread/e38949b1989da1d7

Thanks Hagen.

Initial patch by Tim Caswell.

Deprecation warnings have been added to help the conversion to this new API.

This is similar to the class node.File which was removed in
82cb1b5a.

Needs documentation.