    graph.fromJSON(jsonObject, [options])

Load a graph from a JSON object (not string). Used in conjunction with the `graph.toJSON()` function.

The `options` object may contain additional data that is passed over to graph change event listeners.

Note that this method does not expect a JSON string but rather an object in the JSON format. Use `JSON.parse(jsonString)` if you need to convert a JSON string into the object form:

    graph.fromJSON(JSON.parse(jsonString));

Example of storing stringified JSON objects:

    var jsonString = JSON.stringify(graph.toJSON());
    // ... send jsonString to the server
    // store jsonString to localStorage or do whatever you want
    // later on ...
    graph.fromJSON(JSON.parse(jsonString));

Example of storing JSON objects directly:

    var jsonObject = graph.toJSON();
    // ... send jsonObject to the server
    // store jsonObject (e.g. in a non-relational database)
    // later on ...
    graph.fromJSON(jsonObject)