Added change notes for Release v1.3.3

### v1.3.3
* Added two additional widget areas. The new areas are above
and below the primary content area on pages and single posts. These
areas are ideal for slideshow widgets (both Cyclone Slider and Featured
Articles Lite work well) or social media sharing buttons. These areas
address issues that slider plugins can have when they try to
automatically inject themselves in posts/pages.
* Added tight
integration for the Page Builder plugin by SiteOrigin. This plugin is
now automatically recommended by the theme but is not required and you
can disable the prompt to install it. This plugin allows users to create
advanced responsive, multi-column layouts very easily. You can see the
plugin in use on the homepage of uuwp.org. A row-style has been added
that surrounds widgets in a border. Users who do not use a primary left
sidebar on pages should especially find this plugin helpful for laying
out their full-width pages. This plugin can cause issues with other
plugins that attempt to hook into the main loop and that is one reason I
added the new content header and footer widget areas.
* Fixed CSS for
the Featured Articles Lite plugin when used with this theme. The theme
has specific CSS rules to optimize both the 2.4.x and new 3.x versions
of Featured Articles Lite. Be aware that the new version of the plugin
has fewer FA themes. For version 3.x only the new "Simple" theme is
optimized but it looks modern and polished so that isn't a big problem.
New instructions with recommended settings for the plugin will be posted
to uuwp.org.
* Further optimized images with the EWWW plugin to reduce
size
* Fixed a missing function for posts with the image post-type
*
Removed Meteor Slides customization since it has not been needed since
implementing a header widget area
* Updated TGM Plugin Activation
library to avoid theme check errors