Update copyright notice from Swarming to LUCI; add AUTHORS and CONTRIBUTORS.

appengine/swarming/swarming_bot/main_test.py

 #!/usr/bin/env python
-# Copyright 2014 The Swarming Authors. All rights reserved.
+# Copyright 2014 The LUCI Authors. All rights reserved.
 # Use of this source code is governed by the Apache v2.0 license that can be
 # found in the LICENSE file.
 
 import json
 import os
 import re
 import sys
 import tempfile
 import unittest
 
@@ skipping 108 matching lines @@
       # TODO(maruel): Fix one day.
       self.assertEqual(u'bot_error', events.pop(0)['event'])
     self.assertEqual(expected, events)
 
 
 if __name__ == '__main__':
   fix_encoding.fix_encoding()
   if '-v' in sys.argv:
     unittest.TestCase.maxDiff = None
   unittest.main()