Text Cleaner now removes all periods from the end of the title

As per @coding-horror [comments](https://github.com/discourse/discourse/pull/684#issuecomment-16538221) on #684, this updates `Text Cleaner` to remove **all** periods from the end of the title.

*[should have been in #684]* I've also updated the `topic_view` so that it takes into account any title modifications made server-side (when you edit the title of the topic using the pencil *button*)