Add possibility to use dynamic images

[fbacker]

Added possibility to add dynamic images

$.notify.addStyle('image', {
    html:
      "<div>" +
        "<div class='clearfix'>" +
          "<img class='image' data-notify-html='image'/>" +
          "<div class='title' data-notify-html='title'/>" +
        "</div>" +
      "</div>"
});

$.notify({
    title: "My Text",
    image: "http://myimage.png",
}, {
    style: 'image',
});