Allow saving / loading of networks

[anubisthejackle]

As the subject says, utilize ConvNetJS' save/load functionality to allow for multi-session networks.

[jabrena]

I will try to add some feature to store data into local storage to refresh the url and load the NN in the same status that previous state.
http://www.w3schools.com/html/html5_webstorage.asp

What is

[anubisthejackle]

function savenet() {
  var j = w.agents[0].brain.value_net.toJSON();
  var t = JSON.stringify(j);
  document.getElementById('tt').value = t;
}

function loadnet() {
  var t = document.getElementById('tt').value;
  var j = JSON.parse(t);
  w.agents[0].brain.value_net.fromJSON(j);
  stoplearn(); // also stop learning
  gonormal();
}

[anubisthejackle]

The above is how Karpathy handles it on his demo for the deepqlearn class