Add option to pass my own close modal function

[ssmith353]

Right now I have no way of managing the modal's state, I would like the this.close method to check if there is a this.props.close method, and call that instead.

Right now we have duplicated the modal's code, so that we can mange the state otherwise.

	created() {
		this.eventHandler_ = new EventHandler();
		this.hide = this.hide.bind(this);
	}

		hide() {
		if (this.props.close) {
			this.props.close();
		}
		else {
			this.visible = false;
		}
	}