Adds an IPython kernel running in NaCl, and a wrapper as a Chrome extension.

ports/python_modules/ipython/nacl.patch

-diff -r f628d005a84e IPython/external/pexpect/_pexpect.py
---- a/IPython/external/pexpect/_pexpect.py      Wed Dec 25 03:31:05 2013 +0000
-+++ b/IPython/external/pexpect/_pexpect.py      Mon Dec 30 16:24:58 2013 +0000
+diff -aur ipython-1.1.0/IPython/core/prompts.py ipython-1.1.0-mod/IPython/core/prompts.py
+--- a/IPython/core/prompts.py   2013-09-09 17:36:34.000000000 -0400
++++ b/IPython/core/prompts.py   2014-05-01 14:04:55.414706282 -0400
+@@ -145,7 +145,9 @@
+ # fixed once ipython starts.  This reduces the runtime overhead of computing
+ # prompt strings.
+ USER           = py3compat.str_to_unicode(os.environ.get("USER",''))
+-HOSTNAME       = py3compat.str_to_unicode(socket.gethostname())
++# NACLPORTS NOTE: sockets module is not present in naclports,
++# so we sent HOSTNAME to empty
++HOSTNAME       = '' #py3compat.str_to_unicode(socket.gethostname())
+ HOSTNAME_SHORT = HOSTNAME.split(".")[0]
+ ROOT_SYMBOL    = "#" if (os.name=='nt' or os.getuid()==0) else "$"
+ 
+diff -aur ipython-1.1.0/IPython/external/pexpect/_pexpect.py ipython-1.1.0-mod/IPython/external/pexpect/_pexpect.py
+--- a/IPython/external/pexpect/_pexpect.py      2013-09-09 17:36:34.000000000 -0400
++++ b/IPython/external/pexpect/_pexpect.py      2014-05-01 14:02:38.743366957 -0400
 @@ -70,7 +70,7 @@
      import select
      import re
      import struct
 -    import resource
 +    #import resource
      import types
      import pty
      import tty
 @@ -568,7 +568,8 @@
                  # This is a serious limitation, but not a show stopper.
                  pass
              # Do not allow child to inherit open file descriptors from parent.
 -            max_fd = resource.getrlimit(resource.RLIMIT_NOFILE)[0]
 +            #max_fd = resource.getrlimit(resource.RLIMIT_NOFILE)[0]
 +            max_fd = 1024
              for i in range (3, max_fd):
                  try:
                      os.close (i)
+diff -aur ipython-1.1.0/IPython/kernel/__init__.py ipython-1.1.0-mod/IPython/kernel/__init__.py
+--- a/IPython/kernel/__init__.py        2013-09-09 17:36:34.000000000 -0400
++++ b/IPython/kernel/__init__.py        2014-05-01 15:22:57.690063237 -0400
+@@ -1,11 +1,6 @@
+ """IPython kernels and associated utilities"""
+ 
+-# just for friendlier zmq version check
+-from . import zmq
+-
+-from .connect import *
+-from .launcher import *
+-from .client import KernelClient
+-from .manager import KernelManager
+-from .blocking import BlockingKernelClient
+-from .multikernelmanager import MultiKernelManager
++# NACLPORTS NOTE:
++# This file is left empty because this package
++# is only needed for IPython/kernel/zmq/pylab/backend_inline.py
++# which in turn does not require the rest of the package to load.
+diff -aur ipython-1.1.0/IPython/kernel/zmq/__init__.py ipython-1.1.0-mod/IPython/kernel/zmq/__init__.py
+--- a/IPython/kernel/zmq/__init__.py    2013-09-09 17:36:34.000000000 -0400
++++ b/IPython/kernel/zmq/__init__.py    2014-05-01 15:22:44.529935812 -0400
+@@ -5,13 +5,7 @@
+ #  the file COPYING.txt, distributed as part of this software.
+ #-----------------------------------------------------------------------------
+ 
+-#-----------------------------------------------------------------------------
+-# Verify zmq version dependency >= 2.1.11
+-#-----------------------------------------------------------------------------
+-
+-from IPython.utils.zmqrelated import check_for_zmq
+-
+-check_for_zmq('2.1.11', 'IPython.kernel.zmq')
+-
+-from .session import Session
+-
++# NACLPORTS NOTE:
++# This file is left empty because this package
++# is only needed for IPython/kernel/zmq/pylab/backend_inline.py
++# which in turn does not require the rest of the package to load.