tagging version 0.9.1

git-svn-id: https://plugins.svn.wordpress.org/smart-search/trunk@908386 b8457f37-d9ea-0310-8a92-e5e31aec5664
version 0.9.1 tagged as stable in README

git-svn-id: https://plugins.svn.wordpress.org/smart-search/trunk@908388 b8457f37-d9ea-0310-8a92-e5e31aec5664