remove classlist polyfill, cross browser support is good enough now

README.md

@@ -423,9 +423,6 @@ Reveal.js doesn't _rely_ on any third party scripts to work but a few optional l
 ```javascript
 Reveal.initialize({
 	dependencies: [
-		// Cross-browser shim that fully implements classList - https://github.com/eligrey/classList.js/
-		{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
-
 		// Interpret Markdown in <section> elements
 		{ src: 'plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
 		{ src: 'plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },

demo.html

@@ -399,7 +399,6 @@ Reveal.addEventListener( 'customevent', function() {
 
 				// More info https://github.com/hakimel/reveal.js#dependencies
 				dependencies: [
-					{ src: 'lib/js/classList.js', condition: function() { return !document.body.classList; } },
 					{ src: 'plugin/markdown/marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
 					{ src: 'plugin/markdown/markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
 					{ src: 'plugin/highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },

plugin/markdown/example.html

@@ -121,7 +121,6 @@
 
 				// Optional libraries used to extend on reveal.js
 				dependencies: [
-					{ src: '../../lib/js/classList.js', condition: function() { return !document.body.classList; } },
 					{ src: 'marked.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
                     { src: 'markdown.js', condition: function() { return !!document.querySelector( '[data-markdown]' ); } },
                     { src: '../highlight/highlight.js', async: true, callback: function() { hljs.initHighlightingOnLoad(); } },

test/examples/math.html

@@ -173,7 +173,6 @@
 				},
 
 				dependencies: [
-					{ src: '../../lib/js/classList.js' },
 					{ src: '../../plugin/math/math.js', async: true }
 				]
 			});