Replace ruby-debug19 which doesnt work on 1.9.3 out of the box with a more maintained debugger gem

railties/guides/code/getting_started/Gemfile

@@ -35,4 +35,4 @@ gem 'jquery-rails'
 # gem 'capistrano'
 
 # To use debugger
-# gem 'ruby-debug19', :require => 'ruby-debug'
+# gem 'debugger'

railties/guides/source/debugging_rails_applications.textile

@@ -205,7 +205,7 @@ The debugger used by Rails, +ruby-debug+, comes as a gem. To install it, just ru
 $ sudo gem install ruby-debug
 </shell>
 
-TIP: If you are using Ruby 1.9, you can install a compatible version of +ruby-debug+ by running +sudo gem install ruby-debug19+
+TIP: If you are using Ruby 1.9, you can install a compatible version of +debugger+ by running +sudo gem install debugger+
 
 In case you want to download a particular version or get the source code, refer to the "project's page on rubyforge":http://rubyforge.org/projects/ruby-debug/.
 

railties/lib/rails/generators/app_base.rb

@@ -188,7 +188,7 @@ module Rails
         if RUBY_VERSION < "1.9"
           "gem 'ruby-debug'"
         else
-          "gem 'ruby-debug19', :require => 'ruby-debug'"
+          "gem 'debugger'"
         end
       end
 

railties/test/generators/app_generator_test.rb

@@ -308,10 +308,10 @@ class AppGeneratorTest < Rails::Generators::TestCase
     end
   end
 
-  def test_inclusion_of_ruby_debug19_if_ruby19
+  def test_inclusion_of_debugger_if_ruby19
     run_generator
     assert_file "Gemfile" do |contents|
-      assert_match(/gem 'ruby-debug19', :require => 'ruby-debug'/, contents) unless RUBY_VERSION < '1.9'
+      assert_match(/gem 'debugger'/, contents) unless RUBY_VERSION < '1.9'
     end
   end