Adds catch, cppunit, spdlog, tinyxml(1 and 2), google benchmark (#2627)

* Adds catch, cppunit, spdlog, tinyxml(1 and 2), google benchmark

Tinyxml comes in two flavors, 1 and 2. Each comes in several
versions... So they cannot be easily united into a single package.

* Use CMakePackage and friends, add copyright

Also eleminate debug/release variants, since it no longuer fits in the
CMakePackage format.

* Remove unnecessary url

* spdlog now has tagged releases

* Remove unnecessary url argument

* Fewer quotes in cmake args, because magic

* Incorrect base class for tinyxml

var/spack/repos/builtin/packages/tinyxml2/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 Tinyxml2(CMakePackage):
+    """Simple, small, efficient, C++ XML parser"""
+
+    homepage = "http://grinninglizard.com/tinyxml2/"
+    url = "https://github.com/leethomason/tinyxml2/archive/3.0.0.tar.gz"
+
+    version('4.0.1', '08570d385788f6b02f50f5fd9df32a9d4f8482cc')
+    version('4.0.0', '7a6f0858d75f360922f3ca272f7067e8cdf00489')
+    version('3.0.0', '07acaae49f7dd3dab790da4fe72d0c7ef0d116d1')
+    version('2.2.0', '7869aa08241ce16f93ba3732c1cde155b1f2b6a0')
+    version('2.1.0', '70ef3221bdc190fd8fc50cdd4a6ef440f44b74dc')
+    version('2.0.2', 'c78a4de58540e2a35f4775fd3e577299ebd15117')