remove more leftovers from class_options

Gemfile.lock

@@ -2,13 +2,11 @@ PATH
   remote: .
   specs:
     zero (0.2.0)
-      class_options
       tilt
 
 GEM
   remote: https://rubygems.org/
   specs:
-    class_options (0.0.1)
     coderay (1.0.8)
     devutils (0.0.1)
       rspec

lib/zero.rb

@@ -3,8 +3,6 @@ if RUBY_VERSION <= '1.9'
   require 'zero_fix18'
 end
 
-require 'class_options'
-
 module Zero
   require 'zero/controller'
   require 'zero/router'

lib/zero/controller.rb

@@ -5,7 +5,6 @@ module Zero
   # rack compatible controllers. It catches #call and creates a new instance
   # with the environment and calls #render on it.
   class Controller
-    extend ClassOptions::Options
     # initialize a new instance of the controller and call response on it
     def self.call(env)
       new(env).response