Adds a "Flush Rewrite Rules" button to WP-Admin > Settings > Permalinks.
It was brought to my attention shortly after releasing this plugin that WordPress automatically flushes
rewrite rules when you visit WP-Admin > Settings > Permalinks. Ingenious, right? So don’t bother installing it,
but feel free to check out the code if you are looking for an example of how to:
Enjoy! 🙂