Add -c/--config flag to specify config file path. #59
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This is intended to address #42. It adds a
--config
flag, defaulting to$HOME/.exercism.go
. I also changedconfiguration.ToFile
,configuration.FromFile
, andlogout
to just take paths, instead of taking directories and implicitly looking for.exercism.go
inside those directories.Let me know if this looks fine!