rotate the pod bay doors please hal

robot.js

var Robot = function(robot) {
  this.longAgo = 50;
  this.spot = this.longAgo;
};

Robot.prototype.onIdle = function(e) {
  var r = e.robot;
  r.fire();
  if (this.spot > this.longAgo) {
    r.rotateCannon();
  } else {
    this.spot++;
  }
};

Robot.prototype.onScannedRobot = function(e) {
  var r = e.robot;
  this.spot = 0;
};