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

Makefile

Index: Makefile
diff --git a/Makefile b/Makefile
index 6395e92895802250e2b36735daeeafb50d5cdf6f..8b9523dcc1977bb912cdd63e2fe4891237707349 100644
--- a/Makefile
+++ b/Makefile
@@ -120,6 +120,7 @@ ALL_PORTS = \
      ports/gsl \
      ports/hdf5 \
      ports/imagemagick \
+     ports/ipython_extension \
      ports/jpeg6b \
      ports/jpeg8d \
      ports/jsoncpp \
@@ -454,6 +455,7 @@ dosbox: ports/dosbox ;
 drod: ports/drod ;
 gdb: ports/gdb ;
 git: ports/git ;
+ipython_extension: ports/ipython_extension ;
 mesagl: ports/mesagl ;
 mongoose: ports/mongoose ;
 nano: ports/nano ;