Fixed up ActionEvents worker/uniter/filter tests to reflect AddAction changes
Fixed test behavior of worker Filter to account for change to Action query
Added filter test to ensure pre-queued Actions are properly received on worker event filter
Removed deduplication of Action events from worker uniter filter
Merge pull request #163 from binary132/action-filter-dev

worker ActionEvents filter

Requesting comments, especially on tests.  This branch includes some commits which are waiting on PR 140 and 141 to land, but the API should not change.

I'm not positive this exercises all possible cases; I'm also planning to add a 1-2 second delay in the event consumer loop so we can test adding actions midflight.

All input welcome!