Bring rdoc tasks back to plugins.

railties/lib/rails/generators/rails/plugin/templates/Rakefile.tt

+require 'rake'
 require 'rake/testtask'
+require 'rake/rdoctask'
 
 desc 'Default: run unit tests.'
 task :default => :test
 
 desc 'Test the <%= file_name %> plugin.'
 Rake::TestTask.new(:test) do |t|
+  t.libs << 'lib'
   t.libs << 'test'
   t.pattern = 'test/**/*_test.rb'
+  t.verbose = true
 end
+
+desc 'Generate documentation for the <%= file_name %> plugin.'
+Rake::RDocTask.new(:rdoc) do |rdoc|
+  rdoc.rdoc_dir = 'rdoc'
+  rdoc.title    = '<%= class_name %>'
+  rdoc.options << '--line-numbers' << '--inline-source'
+  rdoc.rdoc_files.include('README')
+  rdoc.rdoc_files.include('lib/**/*.rb')
+end
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