markdown plugin can now process slides that are added at runtime

plugin/markdown/markdown.js

@@ -9,9 +9,8 @@
 	}
 	else {
 		// Browser globals (root is window)
-		root.returnExports = factory( root.marked );
+		root.RevealMarkdown = factory( root.marked );
-		root.returnExports.processSlides();
+		root.RevealMarkdown.initialize();
-		root.returnExports.convertSlides();
 	}
 }( this, function( marked ) {
 
@@ -281,6 +280,11 @@
 
 			var section = sections[i];
 
+			// Only parse the same slide once
+			if( !section.getAttribute( 'data-markdown-parsed' ) ) {
+
+				section.setAttribute( 'data-markdown-parsed', true )
+
 				var notes = section.querySelector( 'aside.notes' );
 				var markdown = getMarkdownFromSlide( section );
 
@@ -296,10 +300,21 @@
 
 		}
 
+	}
+
+	// API
 	return {
+
+		initialize: function() {
+			processSlides();
+			convertSlides();
+		},
+
+		// TODO: Do these belong in the API?
 		processSlides: processSlides,
 		convertSlides: convertSlides,
 		slidify: slidify
+
 	};
 
 }));