m1
v1
v2
v3
v4
v5
m2: Squashed commit of the following:

commit 50dcd4311420cedd0a08e37fe7caee4750881847
Author: Hiroki Horiuchi <x19290@gmail.com>
Date:   Mon Jan 6 16:09:40 2014 +0900

    v5

commit ca7ddbcc8f04bc6a4fc4fb18236481819617cb33
Author: Hiroki Horiuchi <x19290@gmail.com>
Date:   Mon Jan 6 16:09:28 2014 +0900

    v4

commit d67c8c0aaec8fb3fb51e741f891dca3a99959f10
Author: Hiroki Horiuchi <x19290@gmail.com>
Date:   Mon Jan 6 16:09:15 2014 +0900

    v3

commit 202ea79b8cacea1b7e8ab6b16d6a3cc0e5ed6d7b
Author: Hiroki Horiuchi <x19290@gmail.com>
Date:   Mon Jan 6 16:09:02 2014 +0900

    v2

commit 9fbdc72771b59796546b9349e30e601ee0f708cf
Author: Hiroki Horiuchi <x19290@gmail.com>
Date:   Mon Jan 6 16:08:42 2014 +0900

    v1
m3: Merge branch 'volatile'