7天学会，spring cloud系列

A simple event system of java. *support user define their events by inheritts from Event. *support user define their event handlers by implements IEventHandler interface. *support user define event callbacks by implements IEventConsumedCallback interface which will be called after the event was consumed. *fire events and consume events are asynchronized, in muti-threads. *Eventhandlers can be configred in properties file or registed dynamic.