fix problem with command line usuage of feature selection
fix problem with command line usuage of feature selection

MicrosoftGenomics/FaST-LMM,MicrosoftGenomics/FaST-LMM,zhonghualiu/FaST-LMM,zhonghualiu/FaST-LMM,zhonghualiu/FaST-LMM,MicrosoftGenomics/FaST-LMM