fix #18 Added Component API support to react-emoji

[vinnymac]

Tests are passing, but I haven't yet finished any new ones. Please feel free to comment and review :)

I also added some new examples to show how to use the new component.

This will be a breaking change for previous users because of the export changes.

[banyan]

This will be a breaking change for previous users because of the export changes.

I'm happy if we don't have the breaking changes. Let me just consider.

[reimertz]

I have been using this for 1 week now, works really well.

Thanks @vinnymac !

[vinnymac]

@banyan I can remove the breaking change and just let users export a component via destructuring. Not certain what it would be called if we do that though. Using the word component is too vague.

@reimertz you are welcome, glad someone is using it!