Split out test-specific and general utility react components too.
And moved our test/legacy* files for the Style Guide into a styleguide/
subdirectory of test/.
I think we'll be able to live in this directory structure for a while.
npm run transpile
Works on files under js/react/
Outputs files right next to the .tsx file
This is part of our `grunt dev` task, as well as the default grunt task,
which does everything else necessary to get a raw git checkout ready to
run.
