cleaned up proguard task
cleaned up proguard task

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