readme update, kill event listeners when printing pdf

README.md

@@ -585,7 +585,7 @@ Limitations:
 Presentations can be exported to PDF via a special print stylesheet. This feature requires that you use [Google Chrome](http://google.com/chrome).
 Here's an example of an exported presentation that's been uploaded to SlideShare: http://www.slideshare.net/hakimel/revealjs-13872948.
 
-1. Open your presentation with [css/print/pdf.css](https://github.com/hakimel/reveal.js/blob/master/css/print/pdf.css) included on the page. The default index HTML lets you add *print-pdf* anywhere in the query to include the stylesheet, for example: [lab.hakim.se/reveal-js?print-pdf](http://lab.hakim.se/reveal-js?print-pdf).
+1. Open your presentation with `print-pdf` included anywhere in the query string. This triggers the default index HTML to load the PDF print stylesheet ([css/print/pdf.css](https://github.com/hakimel/reveal.js/blob/master/css/print/pdf.css)). You can test this with [lab.hakim.se/reveal-js?print-pdf](http://lab.hakim.se/reveal-js?print-pdf).
 2. Open the in-browser print dialog (CMD+P).
 3. Change the **Destination** setting to **Save as PDF**.
 4. Change the **Layout** to **Landscape**.

js/reveal.js

@@ -335,6 +335,7 @@ var Reveal = (function(){
 
 		// Special setup and config is required when printing to PDF
 		if( isPrintingPDF() ) {
+			removeEventListeners();
 			setupPDF();
 		}