updated vcf_filterer
updated vcf_filterer

DCGenomics/NCBI_August_Hackathon_Push_Button_Genomics_Solution,DCGenomics/NCBI_August_Hackathon_Push_Button_Genomics_Solution,DCGenomics/vcf_parsing_hackathon_v002,DCGenomics/vcf_parsing_hackathon_v002,NCBI-Hackathons/NCBI_August_Hackathon_Push_Button_Genomics_Solution,NCBI-Hackathons/NCBI_August_Hackathon_Push_Button_Genomics_Solution,NCBI-Hackathons/NCBI_August_Hackathon_Push_Button_Genomics_Solution,NCBI-Hackathons/NCBI_August_Hackathon_Push_Button_Genomics_Solution,DCGenomics/vcf_parsing_hackathon_v002,DCGenomics/NCBI_August_Hackathon_Push_Button_Genomics_Solution,DCGenomics/NCBI_August_Hackathon_Push_Button_Genomics_Solution,NCBI-Hackathons/NCBI_August_Hackathon_Push_Button_Genomics_Solution,DCGenomics/vcf_parsing_hackathon_v002,DCGenomics/NCBI_August_Hackathon_Push_Button_Genomics_Solution,DCGenomics/vcf_parsing_hackathon_v002