Update LICENSE

Use the "Annotator contributors" copyright assignment, as this is the
most accurate thing for the inheritance of Annotator and conveys the
intention to have contributors maintain copyright over their own
contributions. However, as there is no significant code remaining that
has not undergone a recent rewrite, change the license on the code as
it now stands, incorporating any remaining derivation under the terms
of its original licensing as MIT (in addition to GPL).

Author: tilgovi

Diff for: LICENSE

@@ -1,25 +1,20 @@
-# xpath-range licensing terms
+The MIT License (MIT)
+Copyright © 2015 The Annotator project contributors
 
-xpath-range is free software, and you may use it under the terms of either
-the MIT or the GNU GPL licenses:
+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:
 
-## GNU GPLv3
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
 
-You can redistribute this program and/or modify it under the terms of the
-GNU General Public License as published by the Free Software Foundation,
-either version 3 of the License, or (at your option) any later version.
-
-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
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program. See LICENSE-GPL, or, if this file is missing,
-<http://www.gnu.org/licenses/>.
-
-## MIT
-
-You may use the software under the terms of the MIT license, which can be
-found in LICENSE-MIT, or, if this file is missing,
-<http://www.opensource.org/licenses/mit-license>.
+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.