nz-modal 能否提供全局事件，如：closeAll

[realmx]

What problem does this feature solve?

当页面打开一个或多个modal时，用户点其它菜单或点击浏览器后退按钮，这些已打开的modal需要一次性全关闭掉

What does the proposed API look like?

希望提供一个closeAll事件，在根页面监听路由变化，可关闭所有modal，如下代码

    constructor(
        private router: Router,
        private modalService: NzModalService
    ) {
        router.events.subscribe(event => {
            if (event instanceof NavigationStart) {
                this.modalService.closeAll();
            }
        });
    }

[vthinkxie]

@wilsoncook please take this into consideration in 0.7.0 version.

[lock]

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