Add libsvm and complete the 1st version of fisher and svm in hw2
Move libsvm folder to matlab/toolbox
Get the hyperplane of SVM, add NN method(1st version)
Merge branch 'develop' of https://github.com/JasonThu/PR into develop

* 'develop' of https://github.com/JasonThu/PR:
  Get the hyperplane of SVM, add NN method(1st version)
  Move libsvm folder to matlab/toolbox
  Add libsvm and complete the 1st version of fisher and svm in hw2
Reset
Reset HW1, add HW2
Rewrite ReadTrainingData, add Pick.m which can randomly pick several data from the whole dataset.
Finished all work in SVM,Fisher,Bayes; TODO: get curve of NN
Finished: HW2
Merge commit '9b76fb72461e874317c0006d9d142dff7791ea81'