Make autoSkip scriptable

Hi. Quite a simple function that is often needed by developers (more precisely, product managers), and no one knows a good solution.

https://jsfiddle.net/oeqvuz75/2/

### Feature Proposal
Make `autoSkip` scriptable or somehow be able to specify not to skip the zero tick.

### Feature Use Case
The problem can be seen in the example. Without a zero axis, bars are going out of "air".

Thanks for your great work.

P.S. Maybe a solution actually already exists?