Added support for passive event listeners with Hamster(el, true)

README.md

@@ -11,7 +11,7 @@ Usage
 The event callback receives 3 extra arguments which are the normalized “deltas” of the mouse wheel.
 
 ```js
-var hamster = Hamster(el);
+var hamster = Hamster(el, false); // boolean is whether passive = true | false
 
 hamster.wheel(function(event, delta, deltaX, deltaY){
   console.log(delta, deltaX, deltaY);
@@ -24,13 +24,16 @@ hamster.unwheel();
 Support
 -------
 
-No jQuery or other libraries required, but an <a href="http://github.com/monospaced/angular-mousewheel">adapter for AngularJS</a> is available.
+The second parameter to Hamster() is optional, and indicates whether to mark the event listener as passive, for performance.  Please do your research about passive event listeners before turning this on.
+
+No jQuery or other libraries are required, but an <a href="http://github.com/monospaced/angular-mousewheel">adapter for AngularJS</a> is available.
 
 Tested in these [core browsers](http://monospaced.github.io/obs).
 
 Install
 -------
 
+    npm install hamsterjs
     bower install hamsterjs
 
 Demo
@@ -43,3 +46,4 @@ Reference
 
 * [jquery-mousewheel](https://github.com/brandonaaron/jquery-mousewheel)
 * [wheel event on MDN](https://developer.mozilla.org/en-US/docs/DOM/Mozilla_event_reference/wheel)
+* [Passive Event Listeners by Google](https://developers.google.com/web/updates/2016/06/passive-event-listeners)

bower.json

@@ -1,6 +1,6 @@
 {
   "name": "hamsterjs",
-  "version": "1.1.2",
+  "version": "1.1.4",
   "main": "hamster.js",
   "ignore": [
     "**/.*",

hamster.d.ts

@@ -0,0 +1,9 @@
+// Type definitions for Hamster.js 1.1.4
+// Definitions by: Kensington Technology associates <[~https://knowledgekta.com~]>
+
+declare function Hamster(el: HTMLElement, passive?: boolean): Hamster;
+
+interface Hamster {
+  wheel( handler, useCapture?: boolean );
+  unwheel();
+}