Created basic elasticsearch node
Added additional sensors
Added config keys required for clustering
Added support for elastic search cluster
Fixed (and simplified) clustering, using automatic zen discovery
Updated following PR review
Updated following PR review, added integration tests
Group notified on member unmanaged

- and member notified on group unmanaged.
- done automatically, without need for registering listeners.
- will be generalised to “relationships” at some point.
Deprecate DynamicGroup.stop
Deserialize: discard dangling ref in ImmutableSet

- If didn’t then it would fail to deserialise, which would cause 
  entire file to fail to deserialise.
  The dangling ref will have been logged plus handled by the 
  RebindExceptionHandler, so mostly harmless ignoring it here.
Fix logging on Effectors.invoke
Tidy QuarantineGroup.expungeMembers
more support for entitlements
filter the applicationresource children according to the entitlements
Update POM file to use Apache parent with minor tidying
Fixes DynamicGroupTest.testGroupAddsAndRemovesManagedAndUnmanagedEntitiesExactlyOnce
Merge remote-tracking branch 'andreaturli/more-entitlements' into more-entitlements
address @aledsage comments from #23 and review @andreaturli in #30:
- mark things beta
- ensure more checks (many done by delegate messages)
- better javadoc and things renamed
This closes #32
BROOKLYN-14: exception handling for rebind policies

- Also adds PersistenceExceptionHandler