Add a.
Add b.
Add c, add d. This is a test. I want to diverge this. Commit messages
will be two lines.

commit 6845e5634e1e99d328e5c26c8c9f695ace54e5c2
Author: pityonline <pityonline@gmail.com>
Date:   Fri Jan 25 17:28:08 2013 +0800

    Add d.

commit 21aa514e38c196129b2fec3f91e789f3ecceac7f
Author: pityonline <pityonline@gmail.com>
Date:   Fri Jan 25 17:27:19 2013 +0800

    Add c
Squashed commit of the following.
add f.