update comments in autocomplete.py

* update comments
* add licence-header

searx/autocomplete.py

+'''
+searx is free software: you can redistribute it and/or modify
+it under the terms of the GNU Affero General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+searx 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 Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with searx. If not, see < http://www.gnu.org/licenses/ >.
+
+(C) 2013- by Adam Tauber, <asciimoo@gmail.com>
+'''
+
+
 from lxml import etree
 from requests import get
 from json import loads
 
 
 def duckduckgo(query):
-    # wikipedia autocompleter
+    # duckduckgo autocompleter
     url = 'https://ac.duckduckgo.com/ac/?{0}&type=list'
 
     resp = loads(get(url.format(urlencode(dict(q=query)))).text)