Added comments to emitter class

package.json

@@ -1,6 +1,6 @@
 {
   "name": "tablefilter",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "A Javascript library making HTML tables filterable and a bit more",
   "license": "MIT",
   "author": {

src/emitter.js

@@ -1,19 +1,41 @@
+/**
+ * Event emitter class
+ */
 export class Emitter {
     constructor() {
+        /**
+         * Events object
+         * @type {Object}
+         */
         this.events = {};
     }
 
+    /**
+     * Subscribe to an event
+     * @param  {String}   evt Event name
+     * @param  {Function} fn  Function invoked when event is emitted
+     */
     on(evt, fn) {
         this.events[evt] = this.events[evt] || [];
         this.events[evt].push(fn);
     }
 
+    /**
+     * Unsubscribe to an event
+     * @param  {String}   evt Event name
+     * @param  {Function} fn  Function invoked when event is emitted
+     */
     off(evt, fn) {
         if(evt in this.events) {
             this.events[evt].splice(this.events[evt].indexOf(fn), 1);
         }
     }
 
+    /**
+     * Emit an event
+     * @param  {String} evt Event name followed by any other argument passed to
+     * the invoked function
+     */
     emit(evt /*, args...*/) {
         if(evt in this.events === false) {
             return;