Update individual dog profiles

[cferdinandi]

One giant image by default, with thumbnail picker below.

<div class="img-main">
    <img src="image.jpg">
</div>
<div class="img-thumbs text-center">
    <img src="image-1.jpg" data-img="img-1-large.jpg">
    <img src="image-2.jpg" data-img="img-2-large.jpg">
    <img src="image-3.jpg" data-img="img-3-large.jpg">
</div>

On click, grab [data-img] src, and replace the content of the .img-main container with it. Also add an active state.