Some static compression/niceness fixes.

 * Ditching the jquery-ui theme. Too much CSS, too many images, too much
   suck. Just using jquery-ui (no CSS), and re-generated a new jquery-ui
   JS file with a smaller footprint.

 * Using custom CSS to style $.autocomplete(), which is one of the two
   things we're still using jquery UI for.

 * Shrunk some image sizes, as per google pagespeed recommendations.

 * Working on getting django-compressor working correctly. Not done with
   that yet.