Replaced Header Slides Integration With Widget Area

For the UUKent website, we transitioned from using Meteor Slider to
Cyclone Slider for our header images.  Instead of adding integration for
Cyclone Slider, I have created a more flexible widget area for headers.
If you add a widget for Meteor Slider, Cyclone Slider, or any other
slider plugin to this area it will replace the WordPress header image
with your widget.  If you were using Meteor Slides, you should go into
your Widgets control panel and add your slideshow to the Header Widget
Area.