engine: mv dumb-reconciler.go -> dumb_reconciler.go
registry: give Bids a string
offer: ignore partitioned offers
engine: drop unused partitioning code
engine: drop wipReconciler
engine: add clusterState object
engine: use clusterState object
engine: move commands from reconciler to Engine
engine: use task mechanism in reconciliation
agent: update reconcilier logging
Merge pull request #706 from bcwaldon/engine-tests

Refactor engine reconciler and add tests!
event: simplity event code

The contents of events no longer matter, so stop wasting
effort on deserialization. There are now only two event
types, JobEvent and GlobalEvent, so big event handlers
are no longer necessary either.