add elementPowSum and elementAbsPowSum to INDArray, AbstractArray, AArrayMatrix, AArrayVector and ZeroArray
add elementPowSum and elementAbsPowSum in matrices
add elementPowSum and elementAbsPowSum to ABitVector, RepeatedElementVector, SingleElementVector, AxisVector, ASparseVector and ZeroVector
fix mistakes
fix another mistake
Merge pull request #58 from prasant94/norm

Norm