add Rails 3 style generators

lib/generators/fast_session_migration/USAGE

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+Description:
+    Creates a migration to add the sessions table used by the FastSessions
+    session store plugin. Pass the migration name, either CamelCased or under_scored,
+    as an argument.
+
+Example:
+    `./script/generate fast_session_migration CreateSessionTable`
+
+    With 4 existing migrations, this creates the CreateSessionTable migration
+    in db/migrate/005_add_session_table.rb
+

lib/generators/fast_session_migration/fast_session_migration_generator.rb

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+class FastSessionMigrationGenerator < Rails::Generators::NamedBase
+  include Rails::Generators::Migration  
+  source_root File.expand_path('../templates', __FILE__)
+
+  def create_migration
+    migration_template  'migration.rb', 'db/migrate/add_fast_sessions'
+  end
+
+  protected
+
+  def default_session_table_name
+    ActiveRecord::Base.pluralize_table_names ? 'fast_session'.pluralize : 'fast_session'
+  end
+
+  def session_table_name
+    default_session_table_name
+  end
+
+  # FIXME: Should be proxied to ActiveRecord::Generators::Base
+  # Implement the required interface for Rails::Generators::Migration.
+  def self.next_migration_number(dirname) #:nodoc:
+    if ActiveRecord::Base.timestamped_migrations
+      Time.now.utc.strftime("%Y%m%d%H%M%S")
+    else
+      "%.3d" % (current_migration_number(dirname) + 1)
+    end
+  end
+
+end

lib/generators/fast_session_migration/templates/migration.rb

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+class <%= class_name %> < ActiveRecord::Migration
+  ActiveRecord::SessionStore::FastSessions.table_name = "<%= session_table_name %>"
+
+  # If you're going to use this module with MySQL 5.1.22+, then you'd 
+  # like to set this to +true+ because it will provide you with consecutive
+  # data inserts in InnoDB. Another cases when you'd like to use it is when
+  # your MySQL server is I/O bound now and you do not want to add random I/O
+  # because of randomized primary key.
+  ActiveRecord::SessionStore::FastSessions.use_auto_increment = false
+
+  def self.up
+    say "Creating sessions table..."
+    ActiveRecord::SessionStore::FastSessions.create_table!
+  end
+
+  def self.down
+    say "Destroying sessions table..."
+    ActiveRecord::SessionStore::FastSessions.drop_table!
+  end
+end