Version 4.1
Implemented all functions of softmax Regression
This module can be reused by later exercise.
modified:   softmaxCost.m
modified:   softmaxExercise.m
modified:   softmaxPredict.m
Version 5.0
Added the original codes of self-taught exercise from Stanford's Web
The self-taught function will be implemented in this version.
	new file:   originalCodeFromStandford/04.softmax/t10k-images-idx3-ubyte.gz
	new file:   originalCodeFromStandford/04.softmax/t10k-labels-idx1-ubyte.gz
	new file:   originalCodeFromStandford/05.selfTaught/stl_exercise.zip
	new file:   originalCodeFromStandford/05.selfTaught/t10k-images-idx3-ubyte.gz
	new file:   originalCodeFromStandford/05.selfTaught/t10k-labels-idx1-ubyte.gz
	new file:   originalCodeFromStandford/05.selfTaught/train-images-idx3-ubyte.gz
	new file:   originalCodeFromStandford/05.selfTaught/train-labels-idx1-ubyte.gz
	new file:   selfTaught/feedForwardAutoencoder.m
	new file:   selfTaught/stlExercise.m