fix order of options extend and listener binding (closes #102)

js/reveal.js

@@ -125,11 +125,12 @@ var Reveal = (function(){
 			dom.controlsDown = document.querySelector( '.reveal .controls .down' );
 		}
 		
-		addEventListeners();
-
 		// Copy options over to our config object
 		extend( config, options );
 		
+		// Subscribe to input
+		addEventListeners();
+
 		// Updates the presentation to match the current configuration values
 		configure();