ngOnChanges missing input argument

[ekuusi]

To make the module AoT compliant, ngOnChanges needs to have an optional input argument.

angular2-nvd3.directive and angular2-nvd3.component are missing that argument. Their methods should be:

    ngOnChanges(changes?) {
        this.ngNvD3.updateWithOptions(this.options, this.data);
    }

[michielvermeir]

Hey, well spotted. I didn't run into this issue before (don't know why exactly), so I missed this one making the config-related changes for AOT. Guess I'll have to make another pull request.