API: Change arguments of emit(), emitSuccess(), emitError()

API: Change arguments of emit(), emitSuccess(), emitError()

Instead of

  myemitter.emit("event", [arg1, arg2, arg3]);

the API is now

  myemitter.emit("event", arg1, arg2, arg3);

This change saves the creation of an extra array object for each event.
The implementation is also slightly more simple.