only delete _bed and _genome in destructor when not using BAM input. Fixes issue #610.
only delete _bed and _genome in destructor when not using BAM input. Fixes issue #610.

jmarshall/bedtools2,arq5x/bedtools2,jmarshall/bedtools2,jmarshall/bedtools2,jmarshall/bedtools2,jmarshall/bedtools2,arq5x/bedtools2,arq5x/bedtools2,arq5x/bedtools2,arq5x/bedtools2