title: How can I refresh Cytoscape after add a new node?
body: <p>My Cytoscape is using arbor layout and I've loaded some nodes in initialization process.
  All worked fine. The nodes was created and moving some time until all stabilizes.</p>
  
  <p>Now, with a button, I've added a new node:</p>
  
  <pre><code>function addNode() {
      var eles = cy.add([
         { group: "nodes", data: { id: 'zz', name: 'MyNewNode', weight: 450, faveColor: '#F5A45D', faveShape: 'rectangle' }, position: { x: 100, y: 100 } },
         { group: "edges", data: { source: 'zz', target: 'a', faveColor: '#F5A45D', strength: 1 } }
      ]);
  }
  </code></pre>
  
  <p>But, as you can see, I need to specify the position of new node.
  How can I force all nodes to reacomodate, so I can add other nodes without concern about positions?</p>