Add support for a JSON configuration file #446
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This PR strives to add support for specifying the configuration options through a file. This PR is motivated by the discussion on #415.
In order to keep changes as smooth as possible we have chosen to leverage the name of the existing environment variables as the JSON keys. We have also chosen JSON so as to avoid delving into parsing logic; besides, JSON encoding/decoding are part of the standard library.
The path to the configuration file is to be passed through the
-conf
flag.In order to remain backwards-compatible, environment variables will always override settings specified on the JSON file. The default values for settings will also be honoured.
At any rate, we're more than happy to change anything that might be needed.
Thanks a ton for your time!
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