Set getValueDependencies symbol to stream/compute results

[m-mujica]

var Person = DefineMap.extend({
  first: "string",
  last: "string",
  fullName: {
    get: function() {
      return this.first + " " + this.last;
    }
  },
  fullNameChangeCount: {
    stream: function() {
      return this.toStream(".fullName").scan(function(last) {
        return last + 1;
      }, 0);
    }
  }
});

canDefineStreamKefir(Person);

var me = new Person({ name: "John", last: "Doe" });
draw(
    document.querySelector("#container"),
    getGraph(me, "fullNameChangeCount")
);

Generates the following dependency graph:

Note how from the the fullNameChangeCount it can see deps all the way to DefineMap.first and DefineMap.last.