.clone() and .toJSON() added to AreaLight

Add .clone() and .toJSON() to AreaLight

src/lights/AreaLight.js

 /**
  * @author MPanknin / http://www.redplant.de/
  * @author alteredq / http://alteredqualia.com/
+ * @author prafullit
  */
 
 THREE.AreaLight = function ( color, intensity ) {
@@ -26,3 +27,31 @@ THREE.AreaLight = function ( color, intensity ) {
 THREE.AreaLight.prototype = Object.create( THREE.Light.prototype );
 THREE.AreaLight.prototype.constructor = THREE.AreaLight;
 
+THREE.AreaLight.prototype.clone = function () {
+
+	var light = new THREE.AreaLight();
+
+	THREE.Light.prototype.clone.call( this, light );
+
+	light.normal.copy(this.normal);
+	light.right.copy(this.right);
+	light.intensity = this.intensity;
+	light.width = this.width;
+	light.height = this.height;
+	light.constantAttenuation = this.constantAttenuation;
+	light.linearAttenuation = this.linearAttenuation;
+	light.quadraticAttenuation = this.quadraticAttenuation
+
+	return light;
+
+};
+
+THREE.AreaLight.prototype.toJSON = function ( meta ) {
+
+	var data = THREE.Object3D.prototype.toJSON.call( this, meta );
+
+	data.object.color = this.color.getHex();
+	data.object.intensity = this.intensity;
+
+	return data;
+};