add event ids to items in the feed so clients can disambiguate
add event ids to items in the feed so clients can disambiguate

Acidburn0zzz/towncrier,robn/towncrier,fastmail/towncrier,fastmail/towncrier,robn/towncrier,robn/towncrier,Acidburn0zzz/towncrier,Acidburn0zzz/towncrier