Support Typescript - create declaration file

[ShlomiRex]

Please make this library be useable with typescript <3

[onmotion]

made refactored fork with TS https://github.com/onmotion/react-tabtab-next

[spacejamjim]

@onmotion are there any other updates in react-tabtab-next? Say being able to keyboard tab through the tabs?

[onmotion]

It's possible, but I don't know the business logic how this action should work. Is there some example? Anyway feel free to make issue about this and even PR :)