mediarss: rating tags without scheme

Description

I'm not sure if this is the right place to report things for the MediaRSS module,
but I don't see a better place.

According to the MediaRSS spec, the scheme element on the rating tag is optional
and has the default value urn:simple. The attached patch implements this.

(An example feed without the scheme: http://www.defcon.org/defconrss.xml)

Environment

None

Status

Assignee

ROME Jira Lead

Reporter

otaylor

Labels

None

Participants

None

Affects versions

current

Priority

Major