tevko/wp-tevko-responsive-images — pull request #2 by kingkool68 (2014-04-07 15:24:52+00:00)
Title: Update wp-tevko-responsive-images.php

You want to enqueue the script on the ‘wp_enqueue_scripts’ action instead of the ‘init’ action. See http://wordpress.stackexchange.com/questions/55924/when-to-use-add-actioninit-vs-add-actionwp-enqueue-scripts