Support ActivityStream Object: event

[wilkie]

Events are social objects that seem important and are referenced by other extensions to ActivityStreams.

http://activitystrea.ms/specs/json/schema/activity-schema.html#event - Base Schema lists special properties for "event" objects.

http://activitystrea.ms/specs/json/replies/1.0/#stream - Responses to ActivityStreams gives attending/maybeAttending/notAttending collections.

http://activitystrea.ms/specs/json/schema/activity-schema.html#verbs - Verb Schema lists these verbs to support: rsvp-maybe, rsvp-yes, rsvp-no