Use an unmanaged fork to decouple inner loop

[kritzcreek]

Comment on #6:

This might need to be an unsafe fork (liftEff <<< launchAff) unless you want to let users to control the lifecycle of the loop with supervised.

[safareli]

@kritzcreek, @natefaubion

I guess the last PR #9 "fixed" this issue too, as launchAff_ is used now, so this can be closed?

[kritzcreek]

I think so, yeah. Thanks!