Upgrade version 3.0

Version 3.0 has a few fixes and improvements but may involve breaking changes for a number of users. Checkout the updated doc to see what's new : http://iamceege.github.io/tooltipster

The three possibly breaking changes you should definitely know about :

- the data in title attributes is now treated as plain text by default. The recommended way of using HTML in your tooltips is to provide a jQuery object, as described in the documentation. However, if you put (hopefully entity-encoded) HTML in your title attributes and do not wish to change your way of doing things, please set the new `contentAsHTML` option to true and you'll be ok.
- renamed and changed the way the `autoClose` option works, both for click and hover triggers, as detailed here https://github.com/iamceege/tooltipster/issues/79. In a nutshell, autoClose == false => tooltip will never close by itself.
- when the `trigger` option is set to 'click', a click (or touch) anywhere in the page will now close the tooltip.

Feedback is welcome.