=== 0.0.4 2012-11-08

* instance-specific method with EventEmitter.apply(instance)

=== 0.0.3 2012-11-08

* call listener with Object#instance_exec

=== 0.0.2 2012-11-07

* EventEmitter#once : call listener only first time
* EventEmitter#add_listener, remove_listener

=== 0.0.1 2012-11-07

* implement "on" and "emit"