update parser for GTF files
update parser for GTF files

jun-wan/scilifelab,jun-wan/scilifelab,senthil10/scilifelab,senthil10/scilifelab,SciLifeLab/scilifelab,senthil10/scilifelab,SciLifeLab/scilifelab,jun-wan/scilifelab,senthil10/scilifelab,jun-wan/scilifelab,SciLifeLab/scilifelab,SciLifeLab/scilifelab