added py-dxchange and its dependencies dxfile,edffile,spefile,tifffile (#4534)

* added py-dxchange and its dependencies dxfile,edffile,spefile,tifffile

* fixed https in homepage of py-dxfile

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

@@ -0,0 +1,41 @@
+##############################################################################
+# 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 PySpefile(PythonPackage):
+    """Reader for SPE files part of pyspec a set of python routines for data
+       analysis of x-ray scattering experiments"""
+
+    homepage = "https://github.com/conda-forge/spefile-feedstock"
+    url      = "https://github.com/conda-forge/spefile-feedstock.git"
+
+    version('1.6', git='https://github.com/conda-forge/spefile-feedstock.git',
+            commit='24394e066da8dee5e7608f556ca0203c9db217f9')
+
+    depends_on('py-setuptools', type='build')
+    depends_on('py-numpy', type='run')
+
+    build_directory = 'recipe/src'