Hook up the callback fn for scrollback. Update CHANGELOG.

CHANGELOG.md

@@ -39,6 +39,8 @@ New features:
    in which they were submitted.
  * Room state is automatcally synchronised when joining a room (including if
    another device joins a room).
+ * Scrollback. You can request earlier events in a room using
+   `MatrixClient.scrollback(room, limit, callback)`.
 
 Bug fixes:
  * Fixed a bug which prevented the event stream from polling. Some devices will

examples/node/app.js

@@ -24,6 +24,10 @@ var rl = readline.createInterface({
 });
 rl.setPrompt("$ ");
 rl.on('line', function(line) {
+    if (line.trim().length === 0) {
+        rl.prompt();
+        return;
+    }
     if (line.indexOf("/join ") === 0 && !viewingRoom) {
         var roomIndex = line.split(" ")[1];
         viewingRoom = roomList[roomIndex];

lib/client.js

@@ -816,9 +816,9 @@ MatrixClient.prototype.scrollback = function(room, limit, callback) {
             utils.map(res.chunk, _PojoToMatrixEventMapper), true
         );
         room.oldState.paginationToken = res.end;
-        defer.resolve(room);
+        _resolve(callback, defer, room);
     }, function(err) {
-        defer.reject(err);
+        _reject(callback, defer, err);
     });
     return defer.promise;
 };