Makes Rakefile activate rdoc >= 2.5.9

Signed-off-by: NXavier Noria <fxn@hashref.com>

actionmailer/Rakefile

-gem 'rdoc', '= 2.2'
+gem 'rdoc', '>= 2.5.9'
 require 'rdoc'
 require 'rake'
 require 'rake/testtask'

actionpack/Rakefile

-gem 'rdoc', '= 2.2'
+gem 'rdoc', '>= 2.5.9'
 require 'rdoc'
 require 'rake'
 require 'rake/testtask'
@@ -89,4 +89,4 @@ task :lines do
   end
 
   puts "Total: Lines #{total_lines}, LOC #{total_codelines}"
-end
\ No newline at end of file
+end

activemodel/Rakefile

 dir = File.dirname(__FILE__)
 
-gem 'rdoc', '= 2.2'
+gem 'rdoc', '>= 2.5.9'
 require 'rdoc'
 
 require 'rake/testtask'

activerecord/Rakefile

-gem 'rdoc', '= 2.2'
+gem 'rdoc', '>= 2.5.9'
 require 'rdoc'
 require 'rake'
 require 'rake/testtask'

activeresource/Rakefile

-gem 'rdoc', '= 2.2'
+gem 'rdoc', '>= 2.5.9'
 require 'rdoc'
 require 'rake'
 require 'rake/testtask'

activesupport/Rakefile

-gem 'rdoc', '= 2.2'
+gem 'rdoc', '>= 2.5.9'
 require 'rdoc'
 require 'rake/testtask'
 require 'rake/rdoctask'

railties/Rakefile

-gem 'rdoc', '= 2.2'
+gem 'rdoc', '>= 2.5.9'
 require 'rdoc'
 require 'rake'
 require 'rake/testtask'