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_build_config

Construct the configuration file. Config file is looked for in three locations:

    ENV
    lib/Mojito/conf/mojito_local.conf
    lib/Mojito/conf/mojito.conf

    The values will be merged with the precedent order being:
    ENV over
    mojito_local.conf over
    mojito.conf

read_config

    Args: a configuration file name
    Returns: a HashRef of configuration values

merge_hash

    Args: ($hash_ref_dominant, $hash_ref_subordinate)
    Returns: HashRef of the two merged with the dominant values
    chosen when they exist otherwise the subordinate values are used.