Remove cleanup-after-each example (#7620)
Remove cleanup-after-each example (#7620)

cleanup is called now by default after each test if the testing framework supports the afterEach global
GreenGremlin/create-react-app,jdcrensh/create-react-app,d3ce1t/create-react-app,facebookincubator/create-react-app,GreenGremlin/create-react-app,GreenGremlin/create-react-app,facebookincubator/create-react-app,jdcrensh/create-react-app,Timer/create-react-app,d3ce1t/create-react-app,d3ce1t/create-react-app,facebookincubator/create-react-app,jdcrensh/create-react-app,d3ce1t/create-react-app,Timer/create-react-app,Timer/create-react-app,GreenGremlin/create-react-app,jdcrensh/create-react-app,Timer/create-react-app