Fixed error when DBBACKUP_MEDIA_PATH not supplied (getattr() raises an exception if the key is not found and no default is supplied).
Implemented DBBACKUP_S3_DOMAIN. Although this was in the documentation, it wasn't actually implemented so larger files (more than a few hundred Mbs) could not be reliably transfered. I've also updated the README to illustrate the correct format (just hostnames, not http urls).
Implemented DBBACKUP_S3_USE_SSL as an optional setting. Defaults to True.