return this from EventEmitter methods

Author: rhuehn

lib/openzwave-shared.js

@@ -33,16 +33,19 @@ var ee = new EventEmitter();
 
 addonModule.Emitter.prototype.addListener = function(evt, callback) {
 	ee.addListener(evt, callback);
+	return this;
 }
 addonModule.Emitter.prototype.on = addonModule.Emitter.prototype.addListener;
 addonModule.Emitter.prototype.emit = function(evt, arg1, arg2, arg3, arg4) {
-	ee.emit(evt, arg1, arg2, arg3, arg4);
+	return ee.emit(evt, arg1, arg2, arg3, arg4);
 }
 addonModule.Emitter.prototype.removeListener = function(evt, callback) {
 	ee.removeListener(evt, callback);
+	return this;
 }
 addonModule.Emitter.prototype.removeAllListeners = function(evt) {
 	ee.removeAllListeners(evt);
+	return this;
 }
 
 module.exports = addonModule.Emitter;