Styleguide deploy missing timestamp

[zendoodles]

Seems likely [timestamp] should actually be a timestamp, but when butler deploys to github pages, the commit message is always:
Updated with Butler - [timestamp]

While we're in that area of the code, it would also be handy to have the commit hash and message of the branch the deploy is working from. You can get this with git log -1 --format="[%ai] %h: %s" So if we were deploying from here:

commit d23a45909d32aec3caade7a73b7e26725860e42c
Author: Amazing Designer <[email protected]>
Date:   Tue Sep 13 14:28:49 2016 -0500

    create breadcrumb component

The commit message would be:
Updated with Butler - [2016-09-13 14:28:49 -0500] d23a459: create breadcrumb component

This suggestion means we get the timestamp of the recent commit, and not the timestamp of the commit which triggers the deployment, but the timestamp of the commit triggering the deployment is already in the commit. If we have the commit log, we probably already have that timestamp.