Fix igvtools to exit with proper codes (0 instead of 1 for success)
Fix igvtools to exit with proper codes (0 instead of 1 for success)

amwenger/igv,igvteam/igv,igvteam/igv,itenente/igv,amwenger/igv,amwenger/igv,godotgildor/igv,itenente/igv,igvteam/igv,amwenger/igv,igvteam/igv,itenente/igv,godotgildor/igv,godotgildor/igv,igvteam/igv,godotgildor/igv,godotgildor/igv,itenente/igv,amwenger/igv,itenente/igv