test via zuul for browser support

I know you all use component so feel free to reject this PR. Zuul allows you to iterate tests without restarting it or doing any build steps. Try it with `npm run test-local` and then open a browser when it tells you.

I dunno how else to make sure this stuff every works and changes don't break things :)

FYI, doesn't work on IE 9 (if you care)