BeansObservables and registering for PropertyChangeEvents

In the past we've been a bit inconsistent about how BeansObservables registered for PropertyChangeEvents. In some cases we'd look for the addPropertyChangeListener(...) method that accepted the name of the property and in others cases we didn't. In order to ensure that your bean worked in all scenarios you had to implement both. As of this weekend we now abide by the bean spec (see section 7.4.1 and 7.4.5) in all cases. We look for the optional, with name, version first but fall back to the unnamed version if it is not found. Also if neither is found a warning is logged with the intention of making issues easier to debug.