Don't mutate original options object passed to EventsClient.list.
Route everything to console if debug option is used.
Add EventsFeedPoller high-level abstraction over the events feed.
Fix next marker handling - only remove first of the returned event if nextMarker
is provided and if it matches the id of the first event (partial matches are
possible).
Fix a typo.
Calling .start() multiple times should be a no-op.
Initialize this._nextMarker.
Split it into multiple functions and make it more readable using async.waterfal.
Merge pull request #7 from racker/events_client_event_emitter

Events Feed Poller behavior