Fix #2361 Document `npm run test:all`
Fix #2361 Document `npm run test:all`

mozilla/idea-town,mozilla/idea-town,fzzzy/testpilot,flodolo/testpilot,meandavejustice/testpilot,lmorchard/idea-town-server,lmorchard/idea-town-server,lmorchard/testpilot,fzzzy/testpilot,lmorchard/idea-town,lmorchard/testpilot,chuckharmston/testpilot,mozilla/idea-town-server,mathjazz/testpilot,mozilla/idea-town-server,mathjazz/testpilot,fzzzy/testpilot,mathjazz/testpilot,lmorchard/idea-town-server,meandavejustice/testpilot,lmorchard/idea-town,meandavejustice/testpilot,flodolo/testpilot,lmorchard/testpilot,chuckharmston/testpilot,chuckharmston/testpilot,mathjazz/testpilot,mozilla/idea-town-server,lmorchard/testpilot,lmorchard/idea-town,flodolo/testpilot,lmorchard/idea-town,mozilla/idea-town,fzzzy/testpilot,mozilla/idea-town,meandavejustice/testpilot,lmorchard/idea-town-server,chuckharmston/testpilot,flodolo/testpilot,mozilla/idea-town-server