Added uninstall.php

git-svn-id: https://plugins.svn.wordpress.org/purple-heart-rating-free/trunk@1052602 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update to 1.3.1

git-svn-id: https://plugins.svn.wordpress.org/purple-heart-rating-free/trunk@1052603 b8457f37-d9ea-0310-8a92-e5e31aec5664