add rails 3 generator

.gitignore

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 pkg
+.DS_Store

lib/generators/timeline_fu/USAGE

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+Generates both the TimelineEvent class and the migration to create its table. The table will have subject, actor and secondary actor as polymorphic associations.
+The use of this generator is optional. See README for more details.

lib/generators/timeline_fu/timeline_fu_generator.rb

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+require 'rails/generators'
+require 'rails/generators/migration'
+
+class TimelineFuGenerator < Rails::Generators::Base
+  include Rails::Generators::Migration
+  source_root File.expand_path(File.join('..', '..', '..', 'generators', 'timeline_fu', 'templates'), File.dirname(__FILE__))
+
+
+  def self.next_migration_number(dirname)
+    if ActiveRecord::Base.timestamped_migrations
+      Time.now.utc.strftime("%Y%m%d%H%M%S")
+    else
+      "%.3d" % (current_migration_number(dirname) + 1)
+    end
+  end
+
+  def create_migration_file
+    copy_file 'model.rb', 'app/models/timeline_event.rb'
+    migration_template 'migration.rb', 'db/migrate/create_timeline_events.rb'
+  end
+end