maintenances
add greedy active set strategy
1. added toggle between greedy and std active set strategy
2. added option to weight positive samples
added predict function that read from stdin (in libsvm format) and output prediction accuracy
recovered the original readline() function (need to set max_line_len every time before calling readline())
commented out in function transformToDenseFormat  nnz printf, which prints number of zeros rather than number of non-zeros.
ready to work on frank's active set questions...
fixed the issue that in command line option (c) for lmd is extracted using atoi (int) instead of atof (double)
added different active set strategy
1. changed weighting in logreg from within the exp to outside loss
2. added back shuffle function for testing
3. refined greedy addzero strategy (added |nzeroActive| every iteration)
4. using default initiation in Parameter struct
added the option to read from a model file and give prediction
added the option to directly deal with sparse data format in logreg
updates
clean up stdSelector()
maintenances
maintenances
improved makefile
improved makefile
improved performance