replace an np.log(0) with an -np.inf
replace an np.log(0) with an -np.inf

mattjj/pyhsmm,mattjj/pyhsmm,theDataGeek/pyhsmm,wgmueller1/pyhsmm,fivejjs/pyhsmm,theDataGeek/pyhsmm,fivejjs/pyhsmm,fivejjs/pyhsmm,theDataGeek/pyhsmm,fivejjs/pyhsmm,wgmueller1/pyhsmm,wgmueller1/pyhsmm,fivejjs/pyhsmm,wgmueller1/pyhsmm,wgmueller1/pyhsmm,theDataGeek/pyhsmm,theDataGeek/pyhsmm