Builder#graph: add blockdiag command
Builder#graph: add blockdiag command

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