fixes to travis setup
fixes to travis setup

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