search box widget improvements

git-svn-id: https://plugins.svn.wordpress.org/instantsearch-for-woocommerce/trunk@961733 b8457f37-d9ea-0310-8a92-e5e31aec5664
magnifying glass image for the search box widget

git-svn-id: https://plugins.svn.wordpress.org/instantsearch-for-woocommerce/trunk@961737 b8457f37-d9ea-0310-8a92-e5e31aec5664
cleaning data store after uninstall + search box widget new code

git-svn-id: https://plugins.svn.wordpress.org/instantsearch-for-woocommerce/trunk@961738 b8457f37-d9ea-0310-8a92-e5e31aec5664
search box widget css changes

git-svn-id: https://plugins.svn.wordpress.org/instantsearch-for-woocommerce/trunk@961739 b8457f37-d9ea-0310-8a92-e5e31aec5664