getCacheKey(actionName, params, meta, keys, actionKeygen) {
		if (isFunction(actionKeygen))
			return actionKeygen.call(this, actionName, params, meta, keys);
		else if (isFunction(this.opts.keygen))
			return this.opts.keygen.call(this, actionName, params, meta, keys);
		else return this.defaultKeygen(actionName, params, meta, keys);
	}
Get a cache key by name and params.
Concatenate the name and the hashed params object

@param {String} actionName
@param {Object} params
@param {Object} meta
@param {Array|null} keys
@param {function?} actionKeygen
@returns {String}