config with instance_eval

	class Application
	attr_reader :router
	def initialize
	@router = Router.new
	end
	end
	class Router
	def initialize
	@arr = []
	end
	attr_reader :arr
	def config &block
	instance_eval &block
	end
	def add_more a
	arr << a
	end
	end
	myApp = Application.new
	myApp.router.config do
	add_more "ena"
	add_more "dio"
	end
	p myApp.router.arr
	#["ena", "dio"]

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