Fix unit tests

[alalamav]

• Since migrating to webpack the unit tests have not been running. This is due to the fact that we create a single JS bundle, whereas jasmine expects individual JS spec files.
• Fixes shadowbox and the manager unit testing by transpiling individual files via tsc (no webpack).
• The manager web app tests for app.spec.ts are still not running because app.ts dependencies (notably polymer) target the browser and use ES6 imports, which is not compatible with jasmine.

[JonathanDCohen]

Is having a separate tsconfig here going to keep us from sharing code between server_manager and shadowbox? I thought we were trying to work towards that end state

[alalamav]

I don't think so - sharing code between workspaces should be orthogonal to the build configuration of each package.

[fortuna]

Also: you can't share code that isn't shareable. If code depends on the broswer environment, you can't run on Node. If code depends on the Node environment, you can't run on the browser. There are polyfills for some things, but that's limited.

[fortuna]

Thanks for fixing the tests.

I think we can submit this, with some tweaks to the scripts that I mentioned.
However, we can still consider using webpack. It's possible to make it take all .spec.ts files as entrypoints, and output them separately. Then all you need to do is call jasmine on them. But that could be on another PR.