remove require_relative to make it 1.8 compatible

lib/zero.rb

@@ -1,7 +1,7 @@
 module Zero
-  require_relative 'zero/controller'
-  require_relative 'zero/router'
-  require_relative 'zero/renderer'
-  require_relative 'zero/request'
-  require_relative 'zero/response'
+  require 'zero/controller'
+  require 'zero/router'
+  require 'zero/renderer'
+  require 'zero/request'
+  require 'zero/response'
 end

lib/zero/request.rb

@@ -1,7 +1,7 @@
-require_relative 'request/accept'
-require_relative 'request/client'
-require_relative 'request/parameter'
-require_relative 'request/server'
+require 'zero/request/accept'
+require 'zero/request/client'
+require 'zero/request/parameter'
+require 'zero/request/server'
 
 module Zero
   # This class wraps around a rack environment for easier access to all data.

lib/zero/request/accept.rb

@@ -1,4 +1,4 @@
-require_relative 'accept_type'
+require 'zero/request/accept_type'
 
 module Zero
   class Request