get(state = _state) {
		if (typeof _stages[state] !== "undefined") {
			return _stages[state].stage;
		} else {
			return undefined;
		}
	}
returns the stage associated with the specified state
(or the current one if none is specified)
@name set
@memberof state
@public
@param {number} [state] - State ID (see constants)
@returns {Stage}