Update query_cqadupstack.py

Changed the licence at Tim's advice.

query_cqadupstack.py

@@ -1,20 +1,18 @@
 #!/usr/bin/env python
 
-#query_cqadupstack.py: a script to manipulate the CQADupStack data set.
-#Copyright (C) 2015 Doris Hoogeveen (doris dot hoogeveen at gmail).
+# Copyright 2015 Doris Hoogeveen (doris dot hoogeveen at gmail)
 
-#This program is free software: you can redistribute it 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.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
 
-#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.
+# http://www.apache.org/licenses/LICENSE-2.0
 
-#You should have received a copy of the GNU General Public License
-#along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
 
 import os, re, sys
 import nltk, json, codecs