Replace graceful/hard shutdown combo with simple exit
Remove unused class
Add RealtimeMetricsMonitor to RealtimeIndexTask
More controllable realtime shutdown

- Realtime plumber will start persisting segments shortly after finishJob is called, regardless
  of rejection policy

- Add "none" rejection policy
RealtimeIndexTask: Allow configurable rejection policies
IndexerCoordinatorResource: Log when remote task action fails
Fix busted condition
RemoteTaskActionClient: Fix http path
ForkingTaskRunner: Use guava Closer to closer stuff
RealtimePlumberSchool: Persist and merge immediately upon finishJob
RemoteTaskActionClient: Log service uri when submitting action
Merge pull request #199 from metamx/indexing-service-mods

Improve robustness and usability of RealtimeIndexTask and some code cleanup in the Indexing Service