Creates a new element with the same name as the method, wrapped in a new collection. Optional attributes
can be passed.
/* Create a <circle> element, wrapped in a collection */
var circle = Pablo.circle();
/* Create a <rect> element, supplying attributes */
// This will create: <rect width="50" height="50"/>
var rectangle = Pablo.rect({width: 50, height: 50});
/* Create an <image> element, with a namespaced attribute */
var img = Pablo.image({'xlink:href': '/villain.svg'});