Visibility of the carousel arrows are not updated when image is loaded

[ttamminen]

The function updateStatics should be called when image load is ready.

Currently, the update function is called, for example, here:

        // when the component is rendered we need to calculate
        // the container size to adjust the responsive behaviour
        this.updateStatics();

But in our case images have not been loaded yet, so wrong dimensions outerWidth(this.thumb0); are being used for the calculation.

I'll create a PR with a fix.

[leandrowd]

Hi @ttamminen, thanks for you PR. All your changes are published as 3.1.7 in npm.