Bugfix for showing the plugin widget on pages if necessary.
Fix for other potential issues.

git-svn-id: https://plugins.svn.wordpress.org/magadanski-similar-posts/trunk@900719 b8457f37-d9ea-0310-8a92-e5e31aec5664
readme typo fix

git-svn-id: https://plugins.svn.wordpress.org/magadanski-similar-posts/trunk@900720 b8457f37-d9ea-0310-8a92-e5e31aec5664