when doing Entity.addChild, create a copy of the spec and set the parent *there* if needed, so that config is inherited even when running `AbstractEntity.init()`
support ProxySslConfig being set from map, so we can configure nginx via yaml
fix typos and warnings
REST API support for setting multiple sensors or config with a map
BROOKLYN-95 - make nginx re-configurable, to switch to ssl while live

a bit sloppy, running connectSensors multiple times, but it works.
better would be a restart which does install again, or to facilitate starting at the same VM.
add nginx yaml sample, and prevent multiple feeds getting added
ensure fields are copied when cloning a spec
fix the rat
This closes #373
Adds AttributeSensor.persistenceMode

- If set to NONE then that attribute’s value will not be persisted, so will
  not be available on rebind.
- Adds Sensors.builder() to avoid too much overloading.
BROOKLYN-102: Fix MongoDB rebind

- Declare STATUS_BSON as transient, so won’t be persisted
  (because that value failed to rebind)
This closes #397
Fixes issue that was causing MongoDBServer to restart after being stopped
Adds missing call to super.connectSensors() to BindDnsServerImpl
This closes #401