Fix for deprecation warnings, use es6 syntax.

[maciekmp]

The source code is up to date with latest react standards, please generete proper dist file an release.

[Kikobeats]

@kimmobrunfeldt can you merge this?

[BossGrand]

what the status of this?

[maciekmp]

Status did not change. Right now it needs only release process. I will try to do it tomorrow so it will be usable at least from my forked repo.