Instance API design

[doodlewind]

For now we can only get new Sinomap instances, without public methods updating them. Imaging some of them:

• sinomap.update() updates map config, e.g., background color or size.
• sinomap.destroy() removes the map.

To dynamically update data, for now we use layers. Still looking for approaches combining layers API with sinomap instance method. Any ideas?

[doodlewind]

API manipulating layers, .e.g., addLayer, removeLayer can also be considered.