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-entrypoints/package.py

@@ -0,0 +1,40 @@
+##############################################################################
+# 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 PyEntrypoints(Package):
+    """Discover and load entry points from installed packages."""
+
+    homepage = "https://pypi.python.org/pypi/entrypoints"
+    url      = "https://files.pythonhosted.org/packages/f8/ad/0e77a853c745a15981ab51fa9a0cb4eca7a7a007b4c1970106ee6ba01e0c/entrypoints-0.2.2-py2.py3-none-any.whl"
+
+    version('0.2.2', '73bd7ce92c19b25dc5a20aff41be996a', expand=False)
+
+    depends_on('py-pip', type='build')
+
+    def install(self, spec, prefix):
+        pip = which('pip')
+        pip('install', self.stage.archive_file, '--prefix={0}'.format(prefix))