Merge pull request #1109 from aledsage/fix/BasicStartable-setsLocations

Sets BasicStartable.locations on start
add a sensor for all hosts:port to cassandra cluster
Merge pull request #1106 from ahgittin/feature/cassandra

add a sensor for all hosts:port to cassandra cluster
Add an integration test to check Nginx config template usage
Merge pull request #1110 from grkvlt/fix/nginx-template-default

Add an integration test to check Nginx config template usage
using backing datagrid: use SetFromLiveMap
added EntityDynamicType.FieldAndValue.toString
InternalLocationFactory tidying
Tidy AttributeMap.NULL marker object

- will be required soon for serializing!
Switch BrooklynStorageFactory for DataGridFactory
Location: store fields in datagrid

- and adds ManagementContextInternal.prePreManage
LocalEntityManager: store entity ids in datagrid
ConfigBag backed by datagrid
LocalLocationManager: backed by datagrid
Fix resolver tests for location.name
Cleanup AbstractLocation.addChild

- temporary badness of some commented out code
Datagrid work: incorporate review comments