New enhanced tags extension

I have just finished the development of a new extension for PUM (http://www.pum.nl - thank you!!) to be able to add a coordinator (with start and end date) to a tag. I have added the extension to the extension directory (https://civicrm.org/extensions/enhanced-tags). The extension is also availalbe on GitHub where you can find a little more documentation: https://github.com/CiviCooP/org.civicoop.enhancedtags.git