$.param({ filter: '.edition' })
// >> "filter=.metal"
$.param({ filter: '.typo' })
// >> "filter=.alkali%2C+alkaline-earth"
$.param({ filter: '.photo' })


$('.option-set a').click(function(){
      // get href attr, remove leading #
  var href = $(this).attr('href').replace( /^#/, '' ),
      // convert href into object
      // i.e. 'filter=.inner-transition' -> { filter: '.inner-transition' }
      option = $.deparam( href, true );
  // set hash, triggers hashchange on window
  $.bbq.pushState( option );
  return false;
});