add tools/pipeline_helpers module
add tools/pipeline_helpers module

the pathway_scores_from_zscores() function replaces the
tools/{go_term,msigdb,cpdb}_analysis.R scripts

DCGenomics/Pharmacogenomics_Prediction_Pipeline_P3,DCGenomics/Pharmacogenomics_Prediction_Pipeline_P3,DCGenomics/Pharmacogenomics_Prediction_Pipeline_P3,NCBI-Hackathons/Pharmacogenomics_Prediction_Pipeline_P3,DCGenomics/multiple_myeloma_rnaseq_drug_response_hackathon_v002,DCGenomics/multiple_myeloma_rnaseq_drug_response_hackathon_v002,daler/Pharmacogenomics_Prediction_Pipeline_P3,NCBI-Hackathons/Pharmacogenomics_Prediction_Pipeline_P3,daler/Pharmacogenomics_Prediction_Pipeline_P3,DCGenomics/multiple_myeloma_rnaseq_drug_response_hackathon_v002,NCBI-Hackathons/Pharmacogenomics_Prediction_Pipeline_P3,daler/Pharmacogenomics_Prediction_Pipeline_P3