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Avoids hung subprocess on macOS 10.12.4 when running a background task

Dean Jackson requested to merge idpaterson:pull-requests/fix-hung-subprocess into master

Created by: idpaterson

As discussed in #111 (closed) there is a problem on macOS 10.12.4 with running a subprocess from a double-forked daemon. Alfred-Workflow follows the classic recommendation for how to do this in Python so unless it is specific to how the Alfred app runs the workflow the problem may affect other python code as well.

This workaround is not predicated on the OS version. If the immediate exit of the parent process is essential to prevent zombie processes and other issues related to forking only once then this may introduce a regression.

The unit tests work fine in 10.12.4 so I think this may be related to how Alfred runs the workflow.

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