Kevin

Use `make_widget` to add a widget to gridstack without creating the DOM element.

Hi @Zacaria, thank you for your PR. 👍 Could you please fix the indentations so that we can see better which lines have changed? See: https://github.com/kdietrich/gridstack-angular/pull/8/files Thanks!

@Zacaria I've added jscs. Could you resubmit your PR? Thanks!

@michaelfaisst Feel free to implement one and send me your PR. I currently don't have time to rewrite for Angular 4.