Added oscillation_factor argument.
Added multiclassification SGD.
Added sigmoid import.
Fixed sigmoid import.
Removed indexes shuffle.
Fixed multiclassStochasticGradientDescent, prediction, accuracy.
Added digit recognizer script.
Added cost and gradient for Newton Conjugate Gradient (scipy).
Added multiclassification algorithm using Newton Conjugate Gradient (scipy).
Added prediction for Newton CG. Fixed cost and gradient. Added scipy import.
Merge branch 'develop' into feature/gradient-descent
Develop (slow) gradient descent algorithm which can be executed from the command line.