Just installed this and it wasn't working, so I dug around a bit and found a few bugs:
You used add_action instead of add_filter in class-frontend.php on line 17.
Also, line 40 should be:
$wpead_options = get_option( 'ead_options' );
(not wpead_options, or it bails out early due to no options being loaded).
PS- Settings link on the plugin list is broken:
options-general.php&page=ead should be options-general.php?page=ead