Remove dimensions from filename featured image

In addition to creating additional dimension, WordPress does keep your original image. Your original image is in this link http://whatweblog.com/wp-content/uploads/2015/05/hue.gif

So, instead of stopping WordPress from creating additional dimension, you should retrieve the full image when displaying the featured image. You can get the full image with this –

the_post_thumbnail('full');

In your case, change

<?php the_post_thumbnail('featured-image', array('class' => 'featured-full-width-top')); ?>

to

<?php the_post_thumbnail('full', array('class' => 'featured-full-width-top')); ?>

Remove Thumbnail Generation

See https://wordpress.stackexchange.com/a/91170/23214

Another easier option I think works is going to your Settings–>Media and setting each box for width and height to 0

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