take a URI from simple_ventilator, return to simple_sink.
renamed YT namespaces.  adding 'activities' and 'playlistItems'.
got all 4 ID types working.
moving config to 'example', so as not to overwrite.
ventilator now also requests activities.  must fix reporter.
sensible reporter for all 4 fetches.
updated the reporter.
Merge pull request #8 from marklar/simple-fetch

fetcher includes: "activities" and "playlistItems"