fix features and candidate generation
fix features and candidate generation

amwenger/dd-genomics,HazyResearch/dd-genomics,amwenger/dd-genomics,HazyResearch/dd-genomics,amwenger/dd-genomics,rionda/dd-genomics,rionda/dd-genomics,HazyResearch/dd-genomics,HazyResearch/dd-genomics,HazyResearch/dd-genomics