Improve license stuff

- Renamed LICENSE -> COPYING.
- Added email addresses.
- Added copyright header in kaabot.py.
- Slightly improved README.

README.md

@@ -9,7 +9,7 @@ Requirements
 * Python 3.1+
 * [SleekXMPP](http://sleekxmpp.com/) 1.3.1
 * [dataset](https://dataset.readthedocs.io/) 0.7.0
-* [pyxdg](https://freedesktop.org/wiki/Software/pyxdg/) 0.25
+* [PyXDG](https://freedesktop.org/wiki/Software/pyxdg/) 0.25
 
 ```
     pip install -r requirements
@@ -56,4 +56,5 @@ optional arguments:
 License
 -------
 
-KaaBot is licensed under the Expat license also known as the MIT License.
+KaaBot is licensed under the terms of the Expat license (also known as the MIT
+License). See the `COPYING` file.

kaabot.py

@@ -1,5 +1,26 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
+#
+# Copyright (c) 2016 Bogdan Cordier <ooctogene@gmail.com>
+#                and Matteo Cypriani <mcy@lm7.fr>
+#
+# 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:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# 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.
 
 import json
 import logging