Apps should be able to load multiple times

[daffl]

Currently you can not load your app twice. This e.g. breaks the tests if spinning up multiple SSR instances in the same process needing them to run separately.

[matthewp]

I think the issue is with CanJS, which expects to be a global. Maybe we can create some tests that don't depend on Can.

[daffl]

I'm not sure. The error you get is a little weird. Even if it expects to be a global, it shouldn't error if you initialize it twice.