Case-insensitive search of a dictionary for key.

        Returns the value if key match is found, otherwise default.

def get_case_insensitive(self, dictionary, key, default=None):
        """Case-insensitive search of a dictionary for key.

        Returns the value if key match is found, otherwise default.
        """
        lower_key = key.lower()
        for k, v in dictionary.items():
            if lower_key == k.lower():
                return v
        else:
            return default