1) Log exception when there is an error removing a segment
Merge branch 'master' of github.com:metamx/druid
Merge branch 'master' of github.com:metamx/druid
1) Adjust SingleSegmentLoader to allow for storing segments on multiple different mount points.  The specification language is really janky right now, so this is remaining a stealth feature for the time being.
[maven-release-plugin] prepare release druid-0.5.5
[maven-release-plugin] prepare for next development iteration
1) Add check whether a Hydrant has already been persisted before persisting.  Persisting happens synchronously on the same thread, but multiple persist requests can be queued up on that thread which means that subsequent ones would fail with an NPE.  Fixes #178
Merge branch 'master' of github.com:metamx/druid into batch-zk

Conflicts:
	server/src/main/java/com/metamx/druid/coordination/ZkCoordinator.java
	server/src/main/java/com/metamx/druid/loading/SingleSegmentLoader.java