Delete deprecated rmiServerPort references
Merge pull request #1152 from aledsage/fix/delete-RmiServerPort

Delete deprecated rmiServerPort references
Adds StringPredicates.isBlank
Fix MutableList.copyOf(Iterable) to accept nulls
Adds Entity.addPolicy(PolicySpec) and addEnricher(EnricherSpec)
Adds entity CHILD_ADDED/CHILD_REMOVED sensors
Adds AbstractEntityAdjunct.getRequiredConfig/emit
Deprecate old enrichers (prefer new builder)
Adds Enrichers.builder()
Refactor to use Enrichers.builder()
Enrichers builder: incorporate review comments
Improve JmxService shutdown
Merge pull request #1150 from aledsage/feature/enrichers-builder

enrichers builder
Merge branch 'master' into feature/software-children

Conflicts:
	api/src/main/java/brooklyn/entity/Entity.java - just imports