Support for a flag to inject environment variables #100
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Add a new option that will take defaults from environment variables if available.
The variable is looked up as the parameter and full uppercase for convenience.
The option use_environment can be used both as a flag or a value can be passed in which allows to set a prefix for the env variables to look for. (Check the tests)
I'm not totally convinced on how the variable is passed around the code. Open to suggestions.
Happy to add docs once we finalise all decisions.
Fixes #94