Adding new package: py-keras (#3400)

* Adding new package: py-keras (and dependencies)

* Fixing dependencies

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

@@ -0,0 +1,39 @@
+##############################################################################
+# 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 PyPydot(PythonPackage):
+    """Python interface to Graphviz's Dot language"""
+
+    homepage = "https://github.com/erocarrera/pydot/"
+    url      = "https://pypi.io/packages/source/p/pydot/pydot-1.2.3.tar.gz"
+
+    version('1.2.3', '5b50fd8cf022811d8718562ebc8aefb2')
+    version('1.2.2', 'fad67d9798dbb33bb3dca3e6d4c47665')
+
+    depends_on('py-setuptools', type='build')
+    depends_on('py-pyparsing@2.1.4:', type=('build', 'run'))
+    depends_on('graphviz', type=('build', 'run'))