code: function convertSizes(sizes) {
  		var tmp = [];
  		for (var size in sizes) {
  			tmp.push({
  				size: size,
  				settings: _.extend({suffix: '', prefix: ''}, sizes[size])
  			});
  		}
  		return tmp;
  	}
docs: In order to do async.each we have to iterate over an array
  Turn the sizes-object into an array of objects.
  @param  {Object} sizes
  @return {Object}