Returns requested category.

        :param name: Category to retrieve.
        :type name: unicode
        :param vivify: Vivify missing parents in the chain to the requested category.
        :type vivify: bool
        :return: Category.
        :rtype: dict

def get_category(self, name, vivify=False):
        """
        Returns requested category.

        :param name: Category to retrieve.
        :type name: unicode
        :param vivify: Vivify missing parents in the chain to the requested category.
        :type vivify: bool
        :return: Category.
        :rtype: dict
        """

        category = self.__get_category(self.__categories, name, vivify)
        if isinstance(category, dict):
            LOGGER.debug("> Category '{0}': '{1}'.".format(name, category))
            return category
        else:
            raise umbra.exceptions.CategoryExistsError("{0} | '{1}' category doesn't exists!".format
                                                       (self.__class__.__name__, name))