Ensure that special characters in post titles do not erroneously cause subtitles to be skipped during title filtering and checks. Fixes https://github.com/philiparthurmoore/Subtitles/issues/3

git-svn-id: https://plugins.svn.wordpress.org/subtitles/trunk@932415 b8457f37-d9ea-0310-8a92-e5e31aec5664