Fix XSS on tooltip content insert with <script> tags

If &lt;title&gt; tag will have &lt;script&gt; tags in it or we will send 'content' parameter with some text that has &lt;script&gt; tags they will be executed on show. It's not good because the content may be dynamic (depends on site's user edits).

I have added **getContent** method that is the only point to get tooltip's title. It makes all filtrations. Later we can add some option to escape tooltip content (disallow HTML) using this method.

P.S. Sorry for so much commits. I'm noob in git :).