Fix https for MathJax CDN

Author: trvrb

reveal/js/config.js

@@ -19,7 +19,7 @@ Reveal.initialize({
 	// parallaxBackgroundSize: '2100px 900px',
 
     math: {
-        mathjax: 'http://cdn.mathjax.org/mathjax/latest/MathJax.js',
+        mathjax: 'https://cdn.mathjax.org/mathjax/latest/MathJax.js',
         config: 'TeX-AMS_HTML-full'  // See http://docs.mathjax.org/en/latest/config-files.html
     },
 

reveal/plugin/math/math.js

@@ -7,7 +7,7 @@
 var RevealMath = window.RevealMath || (function(){
 
 	var options = Reveal.getConfig().math || {};
-	options.mathjax = options.mathjax || 'http://cdn.mathjax.org/mathjax/latest/MathJax.js';
+	options.mathjax = options.mathjax || 'https://cdn.mathjax.org/mathjax/latest/MathJax.js';
 	options.config = options.config || 'TeX-AMS_HTML-full';
 
 	loadScript( options.mathjax + '?config=' + options.config, function() {