Make force_bytes() behave the same on Python 2.7 as it does on 3.x.
Make force_bytes() behave the same on Python 2.7 as it does on 3.x.

pysam-developers/pysam,bioinformed/pysam,bioinformed/pysam,kyleabeauchamp/pysam,pysam-developers/pysam,bioinformed/pysam,kyleabeauchamp/pysam,pysam-developers/pysam,kyleabeauchamp/pysam,kyleabeauchamp/pysam,bioinformed/pysam,pysam-developers/pysam,kyleabeauchamp/pysam,bioinformed/pysam