Right now we have next/previous buttons like: []

The problem: it's confusing. I made a suggestion on how to fix this
once, by reversing the order of the arrows:
`http://bugs.foocorp.net/issues/423 <http://bugs.foocorp.net/issues/423>`_

However I'm not sure this really makes things clearer. Either
ordering is confusing here:


-  [] is what we used to do but this is confusing because our
   galleries go in the opposite direction (newer on left, older on
   right), which is what makes sense for a gallery to be like.
-  [] is what we do now, but that's also totally confusing. Who
   really expects arrows to point this way? Not me (even despite
   filing that old ticket). Imagine reading a webcomic ordered this
   way. That would be crazy! So here's some suggested resolutions:
-  Switch back to the old behavior and add text to the arrows, like
   []
-  Add smaller-thumbnail support (75-100px?) and make these
   thumbnails the navigation.

I'd opt for `#1 </issues/1>`_... maybe we can make #2 a different
ticket and add an ajaxy "quick browser" like flickr has that's
scrollable left and right, and make that **separate** from the
current next/previous arrow buttons. Bonus point: doing
`#1 </issues/1>`_ will fill up some of that glaring whitespace on
those current buttons ;)

Dropping this in Jef's lap! Jef, what do you think?

We could really use a mediagoblin favicon! Not all instances have
to use it, but it'd be nice to have in.

If we scaled down an image (ie, if there's a 'medium' key...) then
the image should link to the original fullsized image.