Spawn a concurrent IO computation and later demand its result. Tiny API
and implementation.
New in version 0.3:
Added functions parMapIO, parMapIO_, and (|*|), which capture
common use cases of spawn.
Updated code to avoid using deprecated functions with base-4.3 and
later (GHC 7.0 and later). The old code is still used with older
base libraries.
Added public GitHub repository.