added numpy/scipy/matplotlib and contributors to readme
added numpy/scipy/matplotlib and contributors to readme

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