Update React Tutorial to match current example
Update React Tutorial to match current example

Summary:Supercedes #630
Closes https://github.com/facebook/jest/pull/747

Differential Revision: D2981416

fb-gh-sync-id: 31364d385a9081b13118394fd6d0b8a654648e72
shipit-source-id: 31364d385a9081b13118394fd6d0b8a654648e72

sampepose/jest,skawian/jest,blainekasten/jest,skawian/jest,alvinsj/jest,Daniel15/jest,aaron-goshine/jest,Daniel15/jest,blainekasten/jest,bookman25/jest,ide/jest,facebook/jest,alvinsj/jest,razh/jest,skovhus/jest,skovhus/jest,aaron-goshine/jest,razh/jest,cpojer/jest,blainekasten/jest,cpojer/jest,ide/jest,mpontus/jest,facebook/jest,aaron-goshine/jest,facebook/jest,mpontus/jest,ide/jest,mpontus/jest,bookman25/jest,cpojer/jest,yungsters/jest,skovhus/jest,yungsters/jest,Daniel15/jest,sampepose/jest,bookman25/jest