added back PossibleChangepoints class
added back PossibleChangepoints class

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