Update README.md
Update README.md
Update README.md
Version 1.5
Adding sparseae_exercise to master
Merge branch 'master' of https://github.com/zhushun0008/deepLearningExerciseOfStanfordOnline
Version 2.0
Implement vectorization
Created a new branch 'vectorization' to implement it.
	new file:   Vectorization/loadMNISTImages.m
	new file:   Vectorization/loadMNISTLabels.m
	new file:   Vectorization/train-images.idx3-ubyte
	new file:   Vectorization/train-labels.idx1-ubyte
	new file:   Vectorization/vectorization.m
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