[WP] [Code Canyon] Custom Backgrounds for WordPress

* New Core
* New Feature: Automatic background selector detector
  (point and click)
* New Feature: Scheduled Backgrounds (date and time availability)
* New Feature: Background timer (set transition delay)
* New Feature: Automatic detection of time zone (cookie set)
* New Feature: Clickable Backgrounds
* New Feature: Multiple Backgrounds
* New Feature: jQuery Background Stretcher (full screen)
* New Feature: jQuery Parallax
* New Feature: Set Master Backgrounds and Child Backgrounds
* New Feature: Background converter from version 2.0 to version 3.0
* New Feature: Use WordPress API to get the plugin URL and path
  (support for alternate content location)
* New Feature: Automatic Update Notification