Add formatting script

diff --git a/contrib/format b/contrib/format
new file mode 100755 (executable)
index 0000000..3e31c1e
--- /dev/null
+++ b/contrib/format
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+autopep8 --in-place --recursive gram
+autopep8 --in-place --recursive examples