bugfix - avoid iteritems for python 3.3 compatibility
bugfix - avoid iteritems for python 3.3 compatibility

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