Squashed commit of the following:

commit 8314a8302123663abf8afa1d894fe77b3fca1c24
Author: Yidong Wang <wangyidong101@gmail.com>
Date:   Sun Feb 3 22:46:17 2013 +0800

    ddddd

commit 6aece70801d6324f4d34bb09a83071251f311036
Author: Yidong Wang <wangyidong101@gmail.com>
Date:   Sun Feb 3 22:45:29 2013 +0800

    add file3.txt