[feature] Add umap spack package

Can install the library, but crashes with --test. Will do for now.

spack/packages/umap/package.py

+##############################################################################
+# Copyright (c) 2013-2018, 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/spack/spack
+# Please also see the NOTICE and LICENSE files 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 Umap(CMakePackage):
+    """Umap is a library to provide an mmmap()-like interface to NVRAM."""
+
+    homepage = "https://github.com/LLNL/umap"
+    url      = "https://github.com/LLNL/umap/archive/v0.0.3.tar.gz"
+
+    version('0.0.3', '724c410a124793b7cf0343a792e0694e')
+    version('develop', git="https://github.com/LLNL/umap.git",
+            branch='develop')
+
+    depends_on('cmake@3.5.1:')
+
+    def cmake_args(self):
+        args = []
+        if self.run_tests:
+            args.append("-DENABLE_TESTS=ON")
+        else:
+            args.append("-DENABLE_TESTS=OFF")
+        return args