The new std.process is ready for review

[Jonas Drewsen]

1, What about support for nonblocking wait(). It would be very 
nice not to block the main thread if you really don't care about 
waiting for the sub process but just want to be nice and not 
create zombies.

2, What about nonblocking read/writes or support for timing out 
reads/writes at least. On linux you can select() on the file 
descriptor but that is not supported on windows.

I believe that support for nonblocking operation is important 
since spawning external processes  is a common way to parallelize 
work and std.concurrency could take advantage of this as well.

/Jonas