Add dependencies and finish the py-tornado package.

This adds the following packages:

 py-backports-shutil-get-terminal-size  py-nbformat
 py-backports-ssl-match-hostname        py-pathlib2
 py-entrypoints                         py-pickleshare
 py-futures                             py-pip
 py-ipykernel                           py-prompt-toolkit
 py-ipython-genutils                    py-ptyprocess
 py-ipywidgets                          py-simplegeneric
 py-jupyter-client                      py-singledispatch
 py-jupyter-console                     py-terminado
 py-jupyter-core                        py-traitlets
 py-jupyter-notebook                    py-wcwidth
 py-monotonic                           py-widgetsnbextension
 py-nbconvert

var/spack/repos/builtin/packages/py-nbformat/package.py

@@ -0,0 +1,47 @@
+##############################################################################
+# Copyright (c) 2013-2016, Lawrence Livermore National Security, LLC.
+# Produced at the Lawrence Livermore National Laboratory.
+#
+# This file is part of Spack.
+# Created by Todd Gamblin, tgamblin@llnl.gov, All rights reserved.
+# LLNL-CODE-647188
+#
+# For details, see https://github.com/llnl/spack
+# Please also see the LICENSE file for our notice and the LGPL.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License (as
+# published by the Free Software Foundation) version 2.1, February 1999.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
+# conditions of the GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+##############################################################################
+from spack import *
+
+
+class PyNbformat(Package):
+    """The Jupyter Notebook format"""
+
+    homepage = "https://github.com/jupyter/nbformat"
+    url      = "https://github.com/jupyter/nbformat/archive/4.1.0.tar.gz"
+
+    version('4.1.0', '826b4fc4ec42553b20144f53b57b4e7b')
+    version('4.0.1', 'ab7172e517c9d561c0c01eef5631b4c8')
+    version('4.0.0', '7cf61359fa4e9cf3ef5e969e2fcb909e')
+
+    extends('python')
+
+    depends_on('py-setuptools', type='build')
+    depends_on('py-ipython-genutils')
+    depends_on('py-traitlets')
+    depends_on('py-jsonschema')
+    depends_on('py-jupyter-core')
+
+    def install(self, spec, prefix):
+        setup_py('install', '--prefix={0}'.format(prefix))