code: function createConfigQueue(modules) {
  
  	return modules
  		.map((mod) => mod._configQueue)
  		.reduce((acc, res) => res.concat(acc), []);
  
  }
docs: Runs through modules and returns an array of config handlers.
  They will be in reversed order of modules order.
  Config execution order:
  Module-A depends on Module-B: [config-B, config-A]
  
  @param  {Array} modules Modules
  @return {Array}         configQueue of all modules