module Middleman::Configuration::Global::ClassMethods

def config
  @_config ||= ConfigurationManager.new
end

def method_missing(method, *args)
  if config.defines_setting? method
    config[method]
  else
    super
  end
end

def respond_to?(method, include_private = false)
  super || config.defines_setting?(method)
end

def set(key, default=nil, &block)
  config.define_setting(key, default)
  @inst.set(key, default, &block) if @inst
end