sendBuddyMsg无效

发不出好友消息。核对过参数貌似没问题，会不会跟cookie有关？

``` javascript
qq.on('message', function(msg) {
    var pollType = msg['poll_type'];
    if(pollType == 'message') {
        var from = msg['from_uin'];
        qq.sendBuddyMsg(from, ['hi']); //直接回复
    }
});
```

此外修改了sendBuddyMsg()一行代码：

``` javascript
chunks.concat([['font', font]])
```
