Convert index.js and ./components to ES6

[AnNOtis]

see #3

[davidLeonardi]

Trailing comma, please remove

[davidLeonardi]

Thanks for this contribution.
Sorry for being a codenazi about the trailing commas, but I think that trailing commas should not be allowed. Anyone else has an opinion on this? I get that it only used to break IE, but still i find it's not really correct JS.
@johannhof @AnNOtis @helielson opinions wanted!

[AnNOtis]

Currently, our eslint configuration enforce trailing comma.
It's base on airbnb/javascript style guide.
More informations 👉 https://github.com/airbnb/javascript#commas

[davidLeonardi]

My personal opinion on that is that it's wrong, and should be changed in the linting settings. This is probably one of the points where i disagree with the airbnb styleguide.
Citing from the interwebs:
"Using ES6 syntax implies full support for ES5. As well as that, today’s transpilers like babel remove the last comma anyway".
So what this tells us, is that babel fixes this for us. Why not simply adhere to the language then?

[davidLeonardi]

Either way, i'd say we should match what ReactNative has.
Seems they allow trailing commas. :(
@AnNOtis do you have a clue what styleguide they adopt?

[davidLeonardi]

Anyhow, as trailing commas match RN's style, i'll consider this a go.