Improve licensing

This commit

- Puts short licenses (MIT/BSD/ISC) in both README and LICENSE
- Puts a license grant for the longer licenses (Apache and GPL) into
  README.rst, and the license text in LICENSE
- Makes GitHub recognise the Apache License, due to the above change
- Updates the NOTICE file to include an attribution, rather than a
  copyright statement
- Renames the GPL option to GPLv3 or later, as some people don't want
  the "or later" part
- Restores the original generic how-to-apply text in the root LICENSE
  file

Author: LourensVeen

LICENSE

@@ -186,7 +186,7 @@
       same "printed page" as the copyright notice for easier
       identification within third-party archives.
 
-   Copyright 2018 Netherlands eScience Center
+   Copyright [yyy] [name of copyright owner]
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.

cookiecutter.json

@@ -4,7 +4,7 @@
   "project_short_description": "",
   "version": "0.1.0",
   "github_organization": "",
-  "open_source_license": ["Apache Software License 2.0", "MIT license", "BSD license", "ISC license", "GNU General Public License v3", "Not open source"],
+  "open_source_license": ["Apache Software License 2.0", "MIT license", "BSD license", "ISC license", "GNU General Public License v3 or later", "Not open source"],
   "Python_version": ["Python 3", "Python 2 and 3", "Python 2"],
   "apidoc": ["no", "yes"],
   "full_name": "John Smith",