message: sending kwargs into shouldSendCallback()
diff: @@ -182,7 +182,7 @@ extend(Raven.prototype, {
  var shouldSend = true;
  if (!this._enabled) shouldSend = false;
  - if (this.shouldSendCallback && !this.shouldSendCallback()) shouldSend = false;
  + if (this.shouldSendCallback && !this.shouldSendCallback(kwargs)) shouldSend = false;
  if (shouldSend) {
  this.send(kwargs, cb);
  