0.8-preview: multiple arguments to computed method

[peterwmwong]

http://jsbin.com/gotosa/4/edit?html,output

Polymer({
  // ...
  computed: {
    sum: 'add(num1,num2)'
  }
  // ...
});

[peterwmwong]

Closing as it appears to now be handled with the new asynchronous computed properties commit