Security update to newest version 4.2.1.

Changes:

Wordpress 4.2:

o Press This has been completely revamped. Clip it, edit it, publish it. Get
  familiar with the new and improved Press This. From the Tools menu, add Press
  This to your browser bookmark bar or your mobile device home screen. Once
  installed you can share your content with lightning speed. Sharing your
  favorite videos, images, and content has never been this fast or this easy.
o Now you can browse and switch installed themes in the Customizer. Browse and
  preview your installed themes from the Customizer. Make sure the theme looks
  great with your content, before it debuts on your site.
o More intuitive plugin update and install from the Plugins Screen. Goodbye
  boring loading screen, hello smooth and simple plugin updates. Click Update Now
  and watch the magic happen.
o Writing in WordPress, whatever your language, just got better.  WordPress 4.2
  supports a host of new characters out-of-the-box, including native Chinese,
  Japanese, and Korean characters, musical and mathematical symbols, and
  hieroglyphs. Don’t use any of those characters? You can still have fun — emoji
  are now available in WordPress! Get creative and decorate your content with 💙,
  🐸, 🐒, 🍕, and all the many other emoji.

Wordpress 4.2.1:

o fix for a critical cross-site scripting (XSS) vulnerability, which could
  enable commenters to compromise a site.

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