Added more options

Added more options to the (now) ExcellenceGateway_Search shortcode, need
to add functionality to ExcellenceGateway_Single (may rename
appropriately). Added the ability to Template results etc. There are
results_default.php and result_item_default.php within Templates that
are used if non are set. There is also a results_paging.php template
that takes advantage of paging and uses the default item template. Need
to doucment options, will wait till little more stable on actual
available options.