`beforeRouter`/`afterRouter` not needed to be validated for isArray

[killmenot]

Hi @robtweed

Please consider the following lines:

qewd/lib/master-express.js

Lines 95 to 102 in cbf87ac

	var options = {
	nextCallback: route.afterRouter ? true : false
	};
	args = args.concat([qx.router(options)]);
	// add array with custom middleware to add after qx.router is called (if present)
	if (route.afterRouter && Array.isArray(route.afterRouter)) args = args.concat(route.afterRouter);

Some notes:

1. I'm not sure that beforeRouter/afterRouter must be validated to be an array because concat works fine if passed argument can be added to existing array -> [1, 2].concat(3) => [1, 2, 3]
2. Another note is that, if we keep the current structure and declare beforeRouter/afterRouter as NOT an array, nextCallback can be set incorrectly (it will be true) but afterRouter won't be added

My proposal here is to allow developers to pass afterRouter as function of array of functions. In this case we do not need to validate beforeRouter/afterRouter for Array.isArray