switch to MIT license (#34)

* switch to MIT license

using OPTiMaDe development team as copyright holder
(open PR on optimade repo for adding this term)

LICENSE

@@ -1,46 +1,20 @@
-optimade Copyright (c) 2018, The Regents of the University of
-California, through Lawrence Berkeley National Laboratory (subject
-to receipt of any required approvals from the U.S. Dept. of Energy).
-All rights reserved.
+Copyright (C) 2019 OPTiMaDe Development Team
 
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions
-are met:
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
 
-(1) Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
 
-(2) Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following
-disclaimer in the documentation and/or other materials provided with
-the distribution.
-
-(3) Neither the name of the University of California, Lawrence
-Berkeley National Laboratory, U.S. Dept. of Energy nor the names of
-its contributors may be used to endorse or promote products derived
-from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
-BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
-ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.
-
-You are under no obligation whatsoever to provide any bug fixes,
-patches, or upgrades to the features, functionality or performance
-of the source code ("Enhancements") to anyone; however, if you
-choose to make your Enhancements available either publicly, or
-directly to Lawrence Berkeley National Laboratory or its
-contributors, without imposing a separate written license agreement
-for such Enhancements, then you hereby grant the following license:
-a  non-exclusive, royalty-free perpetual license to install, use,
-modify, prepare derivative works, incorporate into other computer
-software, distribute, and sublicense such enhancements or derivative
-works thereof, in binary and source code form.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.