configreader allows using different types of config files with the app.

the JSON and YAML configreaders duplicate a ton of code

Differences:

• JSON can only unmarshal into map[string]interface{} while YAML can only unmarshal into map[interface{}]interface{}.
• JSON can only parse float64s, while YAML can also produce ints

These need to be added to get configs working well enough :)

config not passed -> flag not set config passed, file doesn't exist -> flag not set # command should error if a flag isn't set properly config passed, file exists, can't unmarshall -> ERROR config passed, file exists, can unmarshall, invalid path-> ERROR config passed, file exists, can unmarshall, valid path, path not in config -> flag not set config passed, file exists, can unmarshall, valid path, path in config, value error -> ERROR config passed, file exists, can unmarshall, valid path, path in config, value created -> flag set