Fixed SESBackedTest.
Fixed SESBackedTest.

Fixed the SESBackendTest so that the test_send_mail() test passes.
The standard email module's message_from_string() function seems
to parse unicode objects entirely as the message body so I converted
the raw message unicode object to a string.

ticosax/django-ses,brutasse/django-ses,smaato/django-ses,django-ses/django-ses,smaato/django-ses,piotrbulinski/django-ses-backend,ticosax/django-ses,django-ses/django-ses,brutasse/django-ses,grumbler/django-ses,grumbler/django-ses