convert plugins to ES modules, transpile es5 versions backwards compatibility

plugin/search/search.es5

@@ -0,0 +1,7 @@
+/**
+ * This is used to compile a self-registering
+ * es5 compatible version of the plugin.
+ */
+
+import plugin from './search.js'
+Reveal.registerPlugin( plugin );

plugin/search/search.js

@@ -200,7 +200,22 @@ function Hilitor(id, tag)
 			toggleSearch();
 		}
 	}, false );
-	if( window.Reveal ) Reveal.registerKeyboardShortcut( 'CTRL + Shift + F', 'Search' );
+
 	closeSearch();
-	return { open: openSearch };
+
+	return {
+
+		id: 'search',
+
+		init: reveal => {
+
+			reveal.registerKeyboardShortcut( 'CTRL + Shift + F', 'Search' );
+
+		},
+
+		open: openSearch
+
+	}
 })();
+
+export default RevealSearch;