code: function getValue (key, name, raw) {
    if(this.conf.transform) {
      if(typeof(this.conf.transform.value) == 'function') {
        return this.conf.transform.value.call(this, key, name, raw);
      }
    }
    var value = process.env[raw] || this[name];
    if(this.conf.native && typeof(value) == 'string') {
      value = native.to(
        value, this.conf.native.delimiter, this.conf.native.json);
    }
    return value;
  }
docs: Retrieve the value of a variable from the environment.
  
  @api private
  
  @param key The key that has already been passed through
  the key transformation function.
  @param property The name of a property corresponding to the key.
  @param raw The raw untouched key.
  
  @return The value of the environment variable.