Add consideration for onday and offday being the same.
Add consideration for ondate and offdate being the same.
Change time-restrict attributes to on and off, in line with time-restrict-repeat shortcode

git-svn-id: https://plugins.svn.wordpress.org/shortcodes-to-show-or-hide-content/trunk@975805 b8457f37-d9ea-0310-8a92-e5e31aec5664