WIP: Allow to use 'cache-and-network' fetch policy with suspense

[trojanowski]

Closes #13

[trojanowski]

It tries to solve #13 by emulating the cache-and-network policy by using the default cache-first one and then optionally forcing a refetch. The problem with that implementation is that the refetch is also invoked the first time the page is loading.

[trojanowski]

I'm closing it - it's an outdated implementation. I'll try to create a new one when Suspense for data fetching is considered ready by the React team - maybe it'll be easier and less hacky then.