1. make examples callable from root dir
2. improve error message displayed to the user when cpp is not found by
parse_file
diff --git a/examples/cdecl.py b/examples/cdecl.py
index 0e07272..8884591 100644
--- a/examples/cdecl.py
+++ b/examples/cdecl.py
@@ -25,7 +25,7 @@
 # This is not required if you've installed pycparser into
 # your site-packages/ with setup.py
 #
-sys.path.insert(0, '..')
+sys.path.extend(['.', '..'])
 
 from pycparser import c_parser, c_ast