Not working with Webpack
Hi. I am trying to make the iconpicker to work with webpack but seems like it does not. Here is the code I am using:

```
require('../node_modules/bootstrap-iconpicker/bootstrap-iconpicker/css/bootstrap-iconpicker.min.css');
require("imports?jQuery=jquery!../node_modules/bootstrap-iconpicker/bootstrap-iconpicker/js/iconset/iconset-glyphicon.min.js")
require('imports?jQuery=jquery!../node_modules/bootstrap-iconpicker/bootstrap-iconpicker/js/bootstrap-iconpicker.min.js');

... 

$('.btn-iconpicker').iconpicker();
```

I am getting the following error when clicking on the buttons:

```
bootstrap-iconpicker.min.js:22 Uncaught TypeError: $this.popover is not a function
bootstrap-iconpicker.min.js:22 Uncaught TypeError: $(...).popover is not a function
```
