jQuery: Replace `$( document ).on( 'ready', fn )` with `$( fn )`.

The 'ready' event is deprecated since jQuery 1.8.

See https://github.com/jquery/jquery-migrate/blob/1.3.0/warnings.md#jqmigrate-ready-event-is-deprecated.
See #35380.
Built from https://develop.svn.wordpress.org/trunk@36288


git-svn-id: http://core.svn.wordpress.org/trunk@36255 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/mediaelement/wp-mediaelement.js

@@ -56,6 +56,6 @@
 
 	window.wp.mediaelement = new wpMediaElement();
 
-	$( document ).on( 'ready', window.wp.mediaelement.initialize );
+	$( window.wp.mediaelement.initialize );
 
 })( window, jQuery );

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-36287';
+$wp_version = '4.5-alpha-36288';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.