Fix #17: NewReader can't process data bigger than 8K

[MoZhonghua]

I force push to my master branch occasionally and the old pull request closed automatically...

[alphayan]

@MoZhonghua Think you,this is my code ,I use you package,it's just have 8k.Can you give me a example code.

	res, err := http.Get("http://www.apesk.com/16pf/")
	if err != nil {
		fmt.Println(err)
		return
	}
	defer res.Body.Close()
	utfBody, err := iconv.NewReader(res.Body, "gbk", "utf-8")
	if err != nil {
		fmt.Println(err)
		return
	}
	data, _ := ioutil.ReadAll(utfBody)
	fmt.Println(string(data))

[MoZhonghua]

@alphayan

I switch to use "github.com/axgle/mahonia", but don't remeber why.

Please don't use github as forum, if you have other questions, send email to me directly.