Add SES credentials to awsbox deployment

This is an experiment in adding SES credentials to the awsbox deployment, so that it can properly send email in a manner similar to production use.  I'll resist the urge to explain further in this comment, anything that's not clear is something that I need to add to the README.

An alternative approach would be to install a local SMTP server on the awsbox via a post-create hook.  This would allow sending to any email address, but is much more likely to be marked as spam and suffers from traffic limiting imposed by Amazon.

@zaach @dannycoates thoughts on this approach, or the alternative?