Added a vcftools script with `vcf-to-json` command.
Added a vcftools script with `vcf-to-json` command.

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