I wanted to remove them because they were messing with a script I am using to make a sprite of images into a 360 degree image rotator.
I solved it by using the following code:
<?php echo get_the_post_thumbnail( $post->ID, array(0.1,0.1), array('class' => 'reelme') ) ?>
After that I’ve reset the height and width attributes using jQuery.
The 0.1 is a hack to make WordPress not set the height and width attributes. It’s not the most elegant way to do it I guess, if anybody has a better solution please share.