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bats/background-process: Close file descriptor 3

Closes #226. From the comment within `run_in_background`:

Bats duplicates standard output as file descriptor 3 so that output from
its framework functions isn't captured along with any output from the
code under test. If the code under test contains a `sleep` or other
blocking operation, this file descriptor will be held open until the
process becomes unblocked, preventing Bats from exiting. Hence, we
explicitly close file descriptor 3.

Any other code running under Bats that opens a background process should
close this file descriptor as well. See:
https://github.com/sstephenson/bats/issues/80

Much thanks to @marascio for discovering and researching the problem,
and proposing the actual fix.

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