Add 'image' field type to CTC_Widget class for use with new CT Highlight widget
Clean up CT Highlight widget
Add CT Slide widget
Remove code supporting slide and highlight post types (to be handled by widgets)
Add widget/sidebar restrictions (front-end)
Remove inclusion of missing widgets.php
Add widget/sidebar restrictions to admin
Add ability to limit number of widgets in sidebar (front-end) with ctc_sidebar_widget_restrictions
Version bump to 0.5.1