bugfix - missing header
bugfix - missing header

TyberiusPrime/pysam,bioinformed/pysam,carolinux/pysam,daler/pysam,dannon/pysam,brendanofallon/pysam,brendanofallon/pysam,TyberiusPrime/pysam,kyleabeauchamp/pysam,kyleabeauchamp/pysam,mattions/pysam,brendanofallon/pysam,pysam-developers/pysam,nlhepler/pysam,pysam-developers/pysam,dannon/pysam,TyberiusPrime/pysam,mattions/pysam,bioinformed/pysam,bioinformed/pysam,pysam-developers/pysam,dannon/pysam,pysam-developers/pysam,kyleabeauchamp/pysam,kyleabeauchamp/pysam,dannon/pysam,TyberiusPrime/pysam,brendanofallon/pysam,nlhepler/pysam,mattions/pysam,daler/pysam,brendanofallon/pysam,daler/pysam,carolinux/pysam,bioinformed/pysam,carolinux/pysam,bioinformed/pysam,nlhepler/pysam,daler/pysam,nlhepler/pysam,TyberiusPrime/pysam,nlhepler/pysam,mattions/pysam,kyleabeauchamp/pysam,dannon/pysam,carolinux/pysam,daler/pysam,carolinux/pysam,mattions/pysam