Add an `AUTHORS` file and update copyright notices.

Change-Id: Ifb505e5664996c1af41e38376e58ba49864213a3
diff --git a/tools/generate_simulator_traces.py b/tools/generate_simulator_traces.py
index 4a5ffe8..ef1fd33 100755
--- a/tools/generate_simulator_traces.py
+++ b/tools/generate_simulator_traces.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python2.7
 
-# Copyright 2015, ARM Limited
+# Copyright 2015, VIXL authors
 # All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
@@ -32,7 +32,7 @@
 import re
 import util
 
-copyright_header = """// Copyright 2015, ARM Limited
+copyright_header = """// Copyright 2015, VIXL authors
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without