This plugin busted my site when I upgraded to to WP 4.4, and I was sad -- until I discovered that WP 4.4 now includes support for term meta! wp-includes/taxomony.php line 1620. Now I'm happy again! So if you use this plugin, be sure to deactivate and delete it before you upgrade to WP 4.4. Cheers!
Best part of this plugin is that the code is very clean and well-documented. It isn't hard to take this plugin and rework it to work for any metadata you need.
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