setup: Ensure only Karma tests run on win32
setup: Ensure only Karma tests run on win32

In regular win32 environments, redis-server won't be available and
launching browser-test-server in the background doesn't behave
correctly, so we only run Karma tests. In Windows Subsystem for Linux,
launching browsers isn't straightforward and PhantomJS currently crashes
(see https://github.com/mbland/wsl-websocket-crash-demo), so we run all
tests except for Karma tests.

mbland/custom-links,mbland/custom-links,mbland/url-pointers,mbland/url-pointers,mbland/url-pointers,mbland/custom-links