added sjex2bed12 in convert.py
added sjex2bed12 in convert.py


Former-commit-id: d014bbc43896487bb9af0c830ff678e65c7fe67a [formerly bcc51965b0fb544176874d5f3eb77fe57ed462d2]
Former-commit-id: a2aadddb39e074b73cfc4e2143faeb0736fe11c2
kensugino/jGEM