Library for manipulating grib1 and grib2 files (#1736)

Pro tips from @adamjstewart:
* line too long in package description
* name it grib-api instead of grib_api
* depend on netcdf without reference to unnecessary constraints

var/spack/repos/builtin/packages/grib-api/package.py

@@ -0,0 +1,50 @@
+##############################################################################
+# 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 GribApi(Package):
+    """The ECMWF GRIB API is an application program interface accessible from C,
+       FORTRAN and Python programs developed for encoding and decoding WMO
+       FM-92 GRIB edition 1 and edition 2 messages."""
+
+    homepage = "https://software.ecmwf.int/wiki/display/GRIB/Home"
+    url      = "https://software.ecmwf.int/wiki/download/attachments/3473437/grib_api-1.17.0-Source.tar.gz?api=v2"
+
+    version('1.17.0', 'bca7114d2c3100501a08190a146818d2')
+
+    depends_on('netcdf')
+    depends_on('jasper')
+
+    def install(self, spec, prefix):
+        configure_options = [
+            '--prefix={0}'.format(prefix),
+            '--with-netcdf={0}'.format(spec['netcdf'].prefix),
+            '--with-jasper={0}'.format(spec['jasper'].prefix)
+        ]
+        configure(*configure_options)
+
+        make()
+        make('install')