feat(image): fadeIn image

[DwieDima]

It should be possible to configure fadeIn image by passing input parameter to directive.
Currently the workaround is to override the class ng-lazyloaded.

The downside of this way is that this class will be triggered everytime on route change, so you'll see the fadeIn effect everytime. This should not account for already loaded images in persistent DOM.

This can be achieved by creating custom hook, but currently there is a bug described in #554.

Pull Request: #559