wrap JSON.parse to pass tests in Firefox 37
wrap JSON.parse to pass tests in Firefox 37

othree/fetch,pluma/fetch,bmakuh/fetch,othree/fetch,bmakuh/fetch,pluma/fetch,bmakuh/fetch,undoZen/fetch,undoZen/fetch,bmakuh/fetch,pluma/fetch,camsong/fetch-ie8,camsong/fetch-ie8,othree/fetch,undoZen/fetch,camsong/fetch-ie8,undoZen/fetch,pluma/fetch,othree/fetch,camsong/fetch-ie8