NSStream update

[Derek Zhou]

I just merged my NSStream work with the svn head. A (big) patch is
attached.
Changes include: 
- some bug fixs
- some refactoring
- server side stream. This is not defined by apple, however this look
like the resonable things to do. 
Also some tests are attached too. 
I also have some mingw32 porting in the pipe line. 
Derek

 Headers/Foundation/NSStream.h |   55 +++
 Source/GSStream.h             |   46 ++
 Source/GSStream.m             |   37 +-
 Source/unix/NSStream.m        |  666
+++++++++++++++++++++++++++++++++++-------
 Source/win32/NSStreamWin32.m  |   32 ++
 5 files changed, 704 insertions(+), 132 deletions(-)

socket_cs.m
Description: socket_cs.m

nsstream_server_side.patch.gz
Description: nsstream_server_side.patch.gz

pipe.m
Description: pipe.m