[cdn|rackspace] move rackspace cdn to its own shared area (namespacing should probably be corrected)

lib/fog/cdn.rb

@@ -12,7 +12,7 @@ module Fog
         require 'fog/aws/cdn'
         Fog::CDN::AWS.new(attributes)
       when :rackspace
-        require 'fog/cdn/rackspace'
+        require 'fog/rackspace/cdn'
         Fog::CDN::Rackspace.new(attributes)
       else
         raise ArgumentError.new("#{provider} is not a recognized cdn provider")

lib/fog/rackspace.rb

@@ -5,7 +5,7 @@ module Fog
 
     extend Fog::Provider
 
-    service(:cdn,             'cdn/rackspace')
+    service(:cdn,             'rackspace/cdn')
     service(:compute,         'compute/rackspace')
     service(:storage,         'rackspace/storage')
     service(:load_balancers,  'rackspace/load_balancers')

lib/fog/rackspace/cdn.rb

@@ -5,9 +5,9 @@ module Fog
       requires :rackspace_api_key, :rackspace_username
       recognizes :rackspace_auth_url, :persistent
 
-      model_path 'fog/cdn/models/rackspace'
+      model_path 'fog/rackspace/models/cdn'
 
-      request_path 'fog/cdn/requests/rackspace'
+      request_path 'fog/rackspace/requests/cdn'
       request :get_containers
       request :head_container
       request :post_container