Move rake contrib require to task

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8665 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

actionmailer/Rakefile

@@ -4,7 +4,6 @@ require 'rake/testtask'
 require 'rake/rdoctask'
 require 'rake/packagetask'
 require 'rake/gempackagetask'
-require 'rake/contrib/rubyforgepublisher'
 require File.join(File.dirname(__FILE__), 'lib', 'action_mailer', 'version')
 
 PKG_BUILD     = ENV['PKG_BUILD'] ? '.' + ENV['PKG_BUILD'] : ''
@@ -87,6 +86,7 @@ end
 desc "Publish the release files to RubyForge."
 task :release => [ :package ] do
   require 'rubyforge'
+  require 'rake/contrib/rubyforgepublisher'
 
   packages = %w( gem tgz zip ).collect{ |ext| "pkg/#{PKG_NAME}-#{PKG_VERSION}.#{ext}" }