search: add clear results admin-bar button

git-svn-id: https://plugins.svn.wordpress.org/feedly-insight/trunk@848775 b8457f37-d9ea-0310-8a92-e5e31aec5664
update translation

git-svn-id: https://plugins.svn.wordpress.org/feedly-insight/trunk@848776 b8457f37-d9ea-0310-8a92-e5e31aec5664
0.3.3 bump

git-svn-id: https://plugins.svn.wordpress.org/feedly-insight/trunk@848777 b8457f37-d9ea-0310-8a92-e5e31aec5664