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, which means that HTML will not be interpreted 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.