Registers a new recipe.

def register(self, name, path, plugin, description=None, final_words=None):
        """
        Registers a new recipe.
        """
        if name in self.recipes.keys():
            raise RecipeExistsException("Recipe %s was already registered by %s" %
                                        (name, self.recipes["name"].plugin.name))

        self.recipes[name] = Recipe(name, path, plugin, description, final_words)
        self.__log.debug("Recipe %s registered by %s" % (name, plugin.name))
        return self.recipes[name]