fix #739 , wrong Chinese meridiem time

By now I just fixed the time. Now it's:
```
morning < 9 <= forenoon < 11:30 <= noon < 12:30 <= afternoon < 18 <= night
```
I plan to adjust the details once I got accurate concept of the time in Chinese.
And I asked a question at Zhihu: http://www.zhihu.com/question/21251131