This patch allows users to enable dev logs on production systems by
setting the `HIDE_DEV_LOGS` environment variable.
Before, you could only use this on a non-production environment. On
production, the logs would be disabled. This patch changes the behavior
and uses the `NODE_ENV` only as default. On production they are disabled
if `HIDE_DEV_LOGS` is undefined but can be enabled by setting
`HIDE_DEV_LOGS=0` on dev, they are enabled if undefined, but can be
disabled by setting `HIDE_DEV_LOGS=1`.
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