Solr
Add comment describing Solr install
Changed entity name to SolrServer and updated basic configuration
Initial revision of SolrServer entity
Fix broken XML in Solr config file
Updated Solr configuration and test client for tests
Copied jars from distribution to lib dir
Removed unused JMX interfaces
Added Solr contrib libraries
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