Add MC Title 1.8 Interface - API

Update from #26.

MC Title 1.8 ingame example:

![MC Title 1.8 ingame example](http://cdn.idigitaltimes.com/sites/idigitaltimes.com/files/styles/large/public/2014/08/28/2014/05/15/18655.jpg?itok=vVwSA5Tl)
Yes, but a displayed title has only one sub title, if you want to change it you should send another title instance in my opinion.