Provide a simpler version of ses send-email

This PR provides a simplified version of the ``ses send-email`` command.  The simple form is:

    ses send-email --from foo@bar.com --to fie@baz.com --text "This is the message" --subject "testing"

In addition, you can also provide a ``--cc`` and ``-bcc`` option as well as a ``--html`` option for an HTML message body.