// https://github.com/openstreetmap/josm/blob/mirror/src/org/openstreetmap/josm/command/MoveCommand.java
// https://github.com/openstreetmap/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/MoveNodeAction.as
iD.actions.MoveNode = function(nodeId, loc) {
    return function(graph) {
        var node = graph.entity(nodeId);
        return graph.replace(node.update({loc: loc}));
    };
};