use zero/all to require everything

lib/zero.rb

@@ -1,7 +1,2 @@
-require 'rack'
-
 module Zero
-  require_relative 'zero/controller'
-  require_relative 'zero/rack_request'
-  require_relative 'zero/router'
 end

lib/zero/router.rb

@@ -1,3 +1,6 @@
+require 'rack'
+require_relative 'rack_request'
+
 module Zero
   class Router
     # match for variables in routes

spec/spec_helper.rb

@@ -1,4 +1,4 @@
-require 'zero'
+require 'zero/all'
 
 class SpecApp
   attr_reader :env