merge Yutaka HARA's branch. thanks.
merge Yutaka HARA's branch. thanks.

orangain/review,masawada/review,murashitas/review,kmuto/review,orangain/review,krororo/review,masawada/review,suzuki/review,kmuto/review,krororo/review,takahashim/review,suzuki/review,kmuto/review,krororo/review,takahashim/review,kuad9/review_study,murashitas/review,kuad9/review_study