Ssh

----------------------
* SSHClient can be asked not to use an SSH agent now, and not to search
for private keys
* added WarningPolicy option for SSHClient (warn, but allow, on unknown
server keys)
* added Channel.exit_status_ready to poll if a channel has received an
exit status yet
* new demo for reverse port forwarding
* (bug 177117) fix UTF-8 passwords
* (bug 189466) fix typo in osrandom.py
* (bug 191657) potentially fix a race at channel shutdown
* (bug 192749) document that SSHClient.connect may raise socket.error
* (bug 193779) translate EOFError into AuthException during authentication
* (bug 200416) don't create a new logger object for each channel

----------------------
* (bug 137219) catch EINTR and handle correctly
* (bug 157205) fix select() to trigger on stderr for a channel too
* added SSHClient.get_transport()
* added Channel.send_ready()
* added direct-tcpip forwarding [patch from david guerizec]
* fixed the PRNG to be more secure on windows and in cases where fork() is
called [patch from dwayne litzenberger]

--------------------
* windows SSH agent support can use the 'ctypes' module now if 'win32all' is
not available [patch from alexander belchenko]
* SFTPClient.listdir_attr() now preserves the 'longname' field [patch from
wesley augur]
* SFTPClient.get_channel() API added
* SSHClient constuctor takes an optional 'timeout' parameter [patch from
james bardin]

--------------------
* added x11 channel support (patch from david guerizec)
* added reverse port forwarding support
* (bug 75370) raise an exception when contacting a broken SFTP server
* (bug 80295) SSHClient shouldn't expand the user directory twice when reading
RSA/DSS keys
* (bug 82383) typo in DSS key in SSHClient
* (bug 83523) python 2.5 warning when encoding a file's modification time
* if connecting to an SSH agent fails, silently fallback instead of raising
an exception

----------------------
* fix setup.py on osx (oops!)
* (bug 69330) check for the existence of RSA/DSA keys before trying to open
them in SFTPClient
* (bug 69222) catch EAGAIN in socket code to workaround a bug in recent
Linux 2.6 kernels
* (bug 70398) improve dict emulation in HostKeys objects
* try harder to make sure all worker threads are joined on Transport.close()

---------------------
* fixed bug where HostKeys.__setitem__ wouldn't always do the right thing
* fixed bug in SFTPClient.chdir and SFTPAttributes.__str__ [patch from
mike barber]
* try harder not to raise EOFError from within SFTPClient
* fixed bug where a thread waiting in accept() could block forever if the
transport dies [patch from mike looijmans]