moved coverage of commit/rollback to include post_sync signal allowing exceptions to be properly raised
moved coverage of commit/rollback to include post_sync signal allowing exceptions to be properly raised

jpic/nashvegas,paltman-archive/nashvegas,coffindragger/nashvegas,paltman/nashvegas,GunioRobot/nashvegas,marcinn/nashvegas,dcramer/nashvegas,dstufft/nashvegas,peterbe/nashvegas,iivvoo/nashvegas,coffindragger/nashvegas,jonathanchu/nashvegas,dstufft/nashvegas,peterbe/nashvegas,GunioRobot/nashvegas,jpic/nashvegas