function pushOrConcat(base, toPush) {
		if (toPush) {
			if (helpers.isArray(toPush)) {
				//base = base.concat(toPush);
				Array.prototype.push.apply(base, toPush);
			} else {
				base.push(toPush);
			}
		}

		return base;
	}
Provided for backward compatibility, use Chart.plugins instead
@namespace Chart.pluginService
@deprecated since version 2.1.5
@todo remove me at version 3