Removes the first element in the collection and returns it, wrapped in a new collection.
var svg = Pablo(demoElement).svg({height:100}),
collection = Pablo(['circle', 'line', 'rect']);
// Removes and returns the first element, the <circle>
collection.shift()
.attr({cx:50, cy:50, r:50})
.appendTo(svg);
alert(collection.length); // 2