Refactor how rake tasks are loaded

Manifest.txt

@@ -7,6 +7,7 @@ config/hoe.rb
 config/requirements.rb
 lib/annotate_models.rb
 lib/annotate_models/version.rb
+lib/annotate_models/tasks.rb
 log/debug.log
 script/destroy
 script/generate

bin/annotate

 #!/usr/bin/env ruby
-load 'Rakefile'
-require 'tasks/annotate'
+require 'annotate_models/tasks'
 
 Rake::Task['annotate_models'].invoke
 

lib/annotate_models/tasks.rb

+load 'Rakefile'
+Dir[File.join(File.dirname(__FILE__), '../tasks', '**/*.rake')].each { |rake| load rake }
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