Allow setting a symbol as path in scope on routes

Was surprising found that this example doesn't work:

  scope :api do
    resources :users
  end

and the right form to use it is:

  scope 'api' do
    resources :users
  end

I think this should work similary as `namespace` where both are allowed.
These two are equivalent:

  namespace :api do
    resources :users
  end

  namespace 'api' do
    resources :user
  end

actionpack/CHANGELOG.md

 ## Rails 4.0.0 (unreleased) ##
 
+*   Allow setting a symbol as path in scope on routes. This is now allowed:
+
+      scope :api do
+        resources :users
+      end
+
+    also is possible pass multiple symbols to scope to shorten multiple nested scopes:
+
+      scope :api do
+        scope :v1 do
+          resources :users
+        end
+      end
+
+    can be rewritten as:
+
+      scope :api, :v1 do
+        resources :users
+      end
+
+    *Guillermo Iguaran*
+
 *   Fix error when using a non-hash query argument named "params" in `url_for`.
 
     Before:

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -644,7 +644,7 @@ def scope(*args)
           options = args.extract_options!
           options = options.dup
 
-          options[:path] = args.first if args.first.is_a?(String)
+          options[:path] = args.flatten.join('/') if args.any?
           recover = {}
 
           options[:constraints] ||= {}

actionpack/test/dispatch/routing_test.rb

@@ -370,6 +370,14 @@ def self.call(params, request)
       scope :path => 'api' do
         resource :me
         get '/' => 'mes#index'
+        scope :v2 do
+          resource :me, as: 'v2_me'
+          get '/' => 'mes#index'
+        end
+
+        scope :v3, :admin do
+          resource :me, as: 'v3_me'
+        end
       end
 
       get "(/:username)/followers" => "followers#index"
@@ -1467,6 +1475,18 @@ def test_path_scope
     assert_equal 'mes#index', @response.body
   end
 
+  def test_symbol_scope
+    get '/api/v2/me'
+    assert_equal 'mes#show', @response.body
+    assert_equal '/api/v2/me', v2_me_path
+
+    get '/api/v2'
+    assert_equal 'mes#index', @response.body
+
+    get '/api/v3/admin/me'
+    assert_equal 'mes#show', @response.body
+  end
+
   def test_url_generator_for_generic_route
     get 'whatever/foo/bar'
     assert_equal 'foo#bar', @response.body