Adding history to PubNub Messenger.

messenger.js

pubnub.history({
  channel: chatChannel,
  limit: 100
}, function (messages) {
  messages = messages[0];
  messages = messages || [];

  for(var i = 0; i < messages.length; i++) {
    handleMessage(messages[i], false);
  }

  $(document).scrollTop($(document).height());
});