Upon receipt of a notification or unsubscribe confirmation message from
SNS, after the message signature has been verified, the receiver will
now write the re-serialized contents of the message out to the
filesystem. This will allow the messages to be inspected later in order
to develop additional functionality for this service.
The messages are saved in a `messages` director within the current
working directory. This directory contains a subdirectory for each SNS
topic. Within the topic subdirectories, the each message is saved in a
file named with the message timestamp and ID.
Dustin