Improvments in listing events - do not query tag storage when listing events.

Improvments in listing events - do not query tag storage when listing events.

No need to query tag storage 99% of the time we call listEvents. Do not retrieve tags
unless explicitly requested, and when we do, do it in a single batch query for all events
returned in listEvents.  Also, lazy load the tags on events when accessing the tags property.

Still need to do something similar with the geoLocation stuff.