Update sample to also fetch the object, and delete the object and bucket.

Author: Andrew Fitz Gibbon

s3_sample.py

@@ -31,3 +31,13 @@
 
 print "Uploading some data to " + bucket_name + " with key: " + k.key
 k.set_contents_from_string('This is a test of S3. Hello World!')
+
+# Fetch the key to show that we stored something.
+print "Downloading the object we just uploaded:\n"
+print k.get_contents_as_string() + "\n"
+
+print "Now delete the same object"
+k.delete()
+
+print "And finally, delete the bucket."
+s3.delete_bucket(bucket_name)