Neoepiscope

- Adjusts `neoepiscope prep` functionality to accept VCFs only for users who do not wish to run haplotype phasing

- Updates `neoepiscope download` functionality for python3 compatibility

- Includes bug fixes for edge cases in handing indel mutations, accommodating "N"/"\<DEL\>" variants from Pindel VCFs

First public release of software that predicts neoepitopes from tumor/normal DNA-seq data.