added enzyme testing library as suggested by https://github.com/facebookincubator/create-react-app
added enzyme testing library as suggested by https://github.com/facebookincubator/create-react-app

macarthur-lab/xbrowse,macarthur-lab/seqr,macarthur-lab/xbrowse,macarthur-lab/seqr,ssadedin/seqr,macarthur-lab/xbrowse,macarthur-lab/xbrowse,macarthur-lab/xbrowse,ssadedin/seqr,ssadedin/seqr,ssadedin/seqr,macarthur-lab/seqr,ssadedin/seqr,macarthur-lab/seqr,macarthur-lab/seqr,macarthur-lab/xbrowse