Fixes for "router" and "routes" terminology

Commit f7ba614c2d improved the internal consistency of the different
means of accessing routes, but it introduced some problems at the level
of code comments and user-visible strings.

This commit applies fixes on three levels:

Firstly, we remove or replace grammatically invalid constructs such as
"a routes" or "a particular routes".

Secondly, we make sure that we always use "the router DSL" or "the
router syntax", because this has always been the official terminology.

Finally, we make sure that we only use "routes" when referring to the
application-specific set of routes that are defined in the
"config/routes.rb" file, we use "router" when referring on a more
abstract level to "the code in Rails used to handle routing", and we use
"routing" when we need an adjective to apply to nouns such as
"url_helpers. Again this is consistent with historical practice and
other places in the documentation.

Note that this is not a sweep over the entire codebase to ensure
consistent usage of language; it is just a revision of the changes
introduced in commit f7ba614c2d.

Signed-off-by: Wincent Colaiuta <win@wincent.com>
Signed-off-by: José Valim <jose.valim@gmail.com>

actionmailer/lib/action_mailer/base.rb

@@ -737,13 +737,13 @@ module ActionMailer #:nodoc:
         raise "You can no longer call ActionMailer::Base.default_url_options " \
               "directly. You need to set config.action_mailer.default_url_options. " \
               "If you are using ActionMailer standalone, you need to include the " \
-              "url_helpers of a routes directly."
+              "routing url_helpers directly."
       end
     end
 
     # This module will complain if the user tries to set default_url_options
     # directly instead of through the config object. In Action Mailer's Railtie,
-    # we include the url_helpers of the routes, which will override this module
+    # we include the router's url_helpers, which will override this module.
     extend DeprecatedUrlOptions
 
     ActiveSupport.run_load_hooks(:action_mailer, self)

actionpack/lib/action_controller/deprecated/base.rb

@@ -96,7 +96,7 @@ module ActionController
 
       def resource_action_separator=(val)
         ActiveSupport::Deprecation.warn "ActionController::Base.resource_action_separator is deprecated and only " \
-                                        "works with the deprecated routes DSL."
+                                        "works with the deprecated router DSL."
         @resource_action_separator = val
       end
 

actionpack/lib/action_controller/metal.rb

@@ -47,7 +47,7 @@ module ActionController
   #
   # In AbstractController, dispatching is triggered directly by calling #process on a new controller.
   # ActionController::Metal provides an #action method that returns a valid Rack application for a
-  # given action. Other rack builders, such as Rack::Builder, Rack::URLMap, and the Rails routes,
+  # given action. Other rack builders, such as Rack::Builder, Rack::URLMap, and the Rails router,
   # can dispatch directly to the action returned by FooController.action(:index).
   class Metal < AbstractController::Base
     abstract!

actionpack/lib/action_controller/metal/url_for.rb

@@ -13,8 +13,8 @@ module ActionController
     end
 
     def _routes
-      raise "In order to use #url_for, you must include the helpers of a particular " \
-            "routes. For instance, `include Rails.application.routes.url_helpers"
+      raise "In order to use #url_for, you must include routing helpers explicitly. " \
+            "For instance, `include Rails.application.routes.url_helpers"
     end
 
     module ClassMethods

actionpack/lib/action_dispatch/routing/deprecated_mapper.rb

@@ -30,7 +30,7 @@ module ActionDispatch
 
     class DeprecatedMapper #:nodoc:
       def initialize(set) #:nodoc:
-        ActiveSupport::Deprecation.warn "You are using the old routes DSL which will be removed in Rails 3.1. " <<
+        ActiveSupport::Deprecation.warn "You are using the old router DSL which will be removed in Rails 3.1. " <<
           "Please check how to update your routes file at: http://www.engineyard.com/blog/2010/the-lowdown-on-routes-in-rails-3/"
         @set = set
       end

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -308,7 +308,7 @@ module ActionDispatch
 
           if name_prefix = options.delete(:name_prefix)
             options[:as] ||= name_prefix
-            ActiveSupport::Deprecation.warn ":name_prefix was deprecated in the new routes syntax. Use :as instead.", caller
+            ActiveSupport::Deprecation.warn ":name_prefix was deprecated in the new router syntax. Use :as instead.", caller
           end
 
           case args.first

actionpack/lib/action_dispatch/routing/route_set.rb

@@ -480,7 +480,7 @@ module ActionDispatch
         path_options = yield(path_options) if block_given?
         path = generate(path_options, path_segments || {})
 
-        # ROUTES TODO: This can be called directly, so script_name should probably be set in routes
+        # ROUTES TODO: This can be called directly, so script_name should probably be set in the routes
         rewritten_url << (options[:trailing_slash] ? path.sub(/\?|\z/) { "/" + $& } : path)
         rewritten_url << "##{Rack::Mount::Utils.escape_uri(options[:anchor].to_param.to_s)}" if options[:anchor]