Unlock orientation on componentWillUnmount

[ybelenko]

Let's say I need to lock orientation for one specific screen. There is no way to reset orientation lock using your component.

[amiuhle]

@ybelenko Do you want to give this a try and submit a PR?

[ybelenko]

Sure, I did a small update in a fork, but I don't know how to test it. Don't have android device, any suggestions?