Make some properties configurable: cancelListener, cancelable, wrapSe…

[littleylv]

Make some properties configurable: cancelListener, cancelable, wrapSelectorWheel.

Also I add some sample in sample project so you can try it.

wrapSelectorWheel for #1 .

This library is cool and easy to use. 👍 But I am facing a situation when I want to know users click "Cancel" button or just dismiss the dialog or sometimes I don't want user to cancel it.

Could you please accept this pr and make a new version so I can upgrade in my project.