Version 2.1
Implementation of vectorization has been done.
Push this branch to remote/origin/vectorization to log it.
	modified:   Vectorization/vectorization.m
Version 2.2
sparseAutoencoderCost.m includes Regularization and Sparsity which these functions
were not supported in deleted .m files.
deleted:    sparseAutoencoderCostNoRegularNoSparse.m
deleted:    sparseAutoencoderCostNoSparse.m
Version 2.3
modified:   sparseae_exercise/starter/sparseAutoencoderCost.m
modified:   sparseae_exercise/starter/train.m
remove comment code in sparseAutoencoderCost.m
remove tic and toc to test the time consuming.
Version 3.0
Created PCAandWhitening directory
Created originalCodeFromStanford directory to back up the original code from Stanford's Web.
	new file:   PCAandWhitening/IMAGES_RAW.mat
	new file:   PCAandWhitening/display_network.m
	new file:   PCAandWhitening/pcaData.txt
	new file:   PCAandWhitening/pca_2d.m
	new file:   PCAandWhitening/pca_gen.m
	new file:   PCAandWhitening/sampleIMAGESRAW.m
	new file:   originalCodeFromStandford/01.sparseAutoencoder/cs294a_2011-assignment.pdf
	new file:   originalCodeFromStandford/01.sparseAutoencoder/sparseAutoencoder_2011new.pdf
	new file:   originalCodeFromStandford/01.sparseAutoencoder/sparseae_exercise.zip
	new file:   originalCodeFromStandford/02.vectorization/mnistHelper.zip
	new file:   originalCodeFromStandford/02.vectorization/train-images-idx3-ubyte.gz
	new file:   originalCodeFromStandford/02.vectorization/train-labels-idx1-ubyte_2.gz
	new file:   originalCodeFromStandford/03.PCAandWhitening/pca_2d.zip
	new file:   originalCodeFromStandford/03.PCAandWhitening/pca_exercise.zip
	new file:   originalCodeFromStandford/04.softmax/softmax_exercise.zip
	new file:   originalCodeFromStandford/04.softmax/train-images-idx3-ubyte.gz
	new file:   originalCodeFromStandford/04.softmax/train-labels-idx1-ubyte.gz