Remove Copyright from every source file

Replace it by website link; copyright appears in the LICENSE file already, which is sufficient
diff --git a/examples/func_defs.py b/examples/func_defs.py
index 552f860..ed64596 100644
--- a/examples/func_defs.py
+++ b/examples/func_defs.py
@@ -7,7 +7,7 @@
 # This is a simple example of traversing the AST generated by
 # pycparser. Call it from the root directory of pycparser.
 #
-# Copyright (C) 2008-2015, Eli Bendersky
+# Eli Bendersky [http://eli.thegreenplace.net]
 # License: BSD
 #-----------------------------------------------------------------
 from __future__ import print_function