Add EventEmitter APIs introduced in Node 6:
Add EventEmitter APIs introduced in Node 6:

emitter.eventNames() ==> https://nodejs.org/dist/latest-v6.x/docs/api/events.html#events_emitter_eventnames
emitter.prependListener(eventName, listener) ==> https://nodejs.org/dist/latest-v6.x/docs/api/events.html#events_emitter_prependlistener_eventname_listener
emitter.prependOnceListener(eventName, listener) ==>  https://nodejs.org/dist/latest-v6.x/docs/api/events.html#events_emitter_prependoncelistener_eventname_listener

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