Add print-binary example

examples/print-binary.py

+#! /usr/bin/env python
+
+from __future__ import division
+
+import pyopencl as cl
+import sys
+
+ctx = cl.create_some_context()
+with open(sys.argv[1], "r") as inf:
+    src = inf.read()
+
+prg = cl.Program(ctx, src).build()
+
+print(prg.binaries[0].decode())