Fix unintentional re-renders

Thanks for the discussion from #8, I made a improvement by #9

1. Refactor GoodBye Provider with bound object literal that avoids the new React 16.3 context caveats which may leads to unintentional re-render
2. Rename pass function to handlePass. It allows you to do additional actions (of course, you can wrap the handleOk or handleCancel with your own higher-order function!).