Allow cats_config.yml and cats_config.yaml #146
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This change allows us to read configuration data from local files cats_config.yml, cats_config.yaml or config.yml. The first file found (in that order) is read and any others are ignored.
I've also updated the tests to check that this works which involved fun with fixtures. Having thought about it a bit more this could probably be cleaned up with a parameterisation but I'm not sure about extracting the parameter for the test in the fixture ... something for another day.
Still need to update the documentation to match and as well as cleanup in the tests, I'm pretty sure that config_from_file function could be simplified.
Fixes #145