JBPM-2805 access event type from EventListenerExecution

[rebody]

Hi guys,

In order to get event type from EventListener,  I add getName() method in Event.java and add getEvent() in EventListenerListener.  Here is the patch and related testcase.  I think this feature is harmless,  although I changed some api interface method.

https://jira.jboss.org/browse/JBPM-2805

Please tell me what you think about it.  Thank you very much.

[swiderski.maciej]

Looks good to me. As stated in jira it is rather important extension to the API.