upgraded slf4j to 1.7.9
upgraded slf4j to 1.7.9

jasonchaffee/moco,sandyway/moco,zhigang1992/moco,yonglehou/moco,ysjian/moco,jasonchaffee/moco,cgourlay/moco,ForrestVV/moco,LiuShulong/moco,dreamhead/moco,yonglehou/moco,ForrestAlfred/moco,ysjian/moco,ruiruiguo/moco,sandyway/moco,cgourlay/moco,ForrestAlfred/moco,dreamhead/moco,ruiruiguo/moco,ForrestVV/moco,LiuShulong/moco,rickhan2014/moco,zhigang1992/moco,rickhan2014/moco