Adds a stroke around the cell view's $el.

Available options:

Example usage:

cellView.highlight(null/* defaults to cellView.el */, {
    highlighter: {
        name: 'stroke',
        options: {
            padding: 10,
            rx: 5,
            ry: 5,
            attrs: {
                'stroke-width': 3,
                stroke: '#FF0000'
            }
        }
    }
});