Check & create parent directory before calling FileOutputStream

[deusaquilus]

In addition to #372 please check that when opening the FileOutputStream the parent directory of the file exists (and create it if it doesn't). Have a look in commons-io at FileUtils.openOutputStream (here) or PathUtils.newOutputStream (here).

Both of those functions:

1. Check that the parent directory of the file exists, if it does not then create it.
2. Check that the file exists
3. Check that the file is writable (not possible with 'path' API)

[jdegoes]

This is still relevant to zio.logging.internal.FileWriter.