Added license header

twik

@@ -1,4 +1,24 @@
 #!/usr/bin/env python
+# -*- coding: utf-8; -*-
+"""
+Copyright 2014  Alexandre Possebom alexandrepossebom@gmail.com
+
+This file is part of twik.
+
+Twik 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.
+
+Twik 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 Twik.  If not, see <http://www.gnu.org/licenses/>.
+"""
+
 from hashlib import sha1
 from random import SystemRandom
 import hmac
@@ -95,5 +115,4 @@ def main(argv):
 if __name__ == "__main__":
     main(sys.argv[1:])
 
-
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4