Switch jackson version back to 2.5.1
Switch jackson version back to 2.5.1

xuzhongxing/deeplearning4j,crockpotveggies/deeplearning4j,crockpotveggies/deeplearning4j,xuzhongxing/deeplearning4j,xuzhongxing/deeplearning4j,xuzhongxing/deeplearning4j,crockpotveggies/deeplearning4j,xuzhongxing/deeplearning4j,crockpotveggies/deeplearning4j,crockpotveggies/deeplearning4j,crockpotveggies/deeplearning4j,xuzhongxing/deeplearning4j