Add Config Object & Tests

This object is responsible for abstracting the loadding of config files
from disk and the sanitization of config file contents. Future commits
will move logic from the main `bin/snooper` script into this class and
remove some of the config-specific logit from `Snoop`.
Quieten Up the Options Tests

This prevents the testing of the options class from spewing help messages
and similar into the standard ouput of the tests.