Remove Rake::DSL because causes some errors on 1.9.2

Rakefile

@@ -2,11 +2,11 @@
 require 'rubygems' unless defined?(Gem)
 require 'rake/clean'
 require 'rake/contrib/sshpublisher'
-require 'fileutils'
-require 'rake/dsl_definition'
+require 'fileutils' unless defined?(FileUtils)
+# require 'rake/dsl_definition'
 require 'rdoc/task'
 
-include Rake::DSL
+# include Rake::DSL
 
 require File.expand_path("../padrino-core/lib/padrino-core/version.rb", __FILE__)
 begin
@@ -142,4 +142,4 @@ task :pdoc => :rdoc do
   puts "Publishing doc on padrinorb.com ..."
   Rake::SshDirPublisher.new("[email protected]", "/mnt/www/apps/padrino/public/api", "doc").upload
   FileUtils.rm_rf "doc"
-end
+end