Remove rake db:forward and rake db:rollback tasks (refs #9)

Those tasks makes not much sense in the case of TimeStampMigrator
migrations (used by this gem generator). For more information see:
https://groups.google.com/forum/?fromgroups=#!topic/sequel-talk/eXKNhxrhdBw

History.md

@@ -1,6 +1,9 @@
 0.4.0.pre2
 ==========
 
+* Remove `rake db:forward` and `rake db:rollback` as it makes not much sense
+  when using the TimeStampMigration which is how this gem generates migrations
+* Ensure rake tasks returns appropriate code on errors
 * Ensure PostgreSQL adapter passes the right options to both create and drop 
   database (Sascha Cunz)
 

README.md

@@ -66,14 +66,12 @@ rake db:create:all                    # Create all the local databases defined i
 rake db:drop[env]                     # Create the database defined in config/database.yml for the current Rails.env
 rake db:drop:all                      # Drops all the local databases defined in config/database.yml
 rake db:force_close_open_connections  # Forcibly close any open connections to the test database 
-rake db:forward                       # Pushes the schema to the next version. Specify the number of steps with STEP=n
 rake db:migrate                       # Migrate the database to the latest version
 rake db:migrate:down                  # Runs the "down" for a given migration VERSION.
 rake db:migrate:redo                  # Rollbacks the database one migration and re migrate up.
 rake db:migrate:reset                 # Resets your database using your migrations for the current environment
 rake db:migrate:up                    # Runs the "up" for a given migration VERSION.
 rake db:reset                         # Drops and recreates the database from db/schema.rb for the current environment and loads the seeds.
-rake db:rollback                      # Rollbacks the database one migration and re migrate up. If you want to rollback more than one step, define STEP=x. Target specific version with VERSION=x.
 rake db:schema:dump                   # Create a db/schema.rb file that can be portably used against any DB supported by Sequel
 rake db:schema:load                   # Load a schema.rb file into the database
 rake db:seed                          # Load the seed data from db/seeds.rb

lib/sequel_rails/railties/database.rake

@@ -93,7 +93,6 @@ namespace :db do
       end
     end
 
-
     desc 'Resets your database using your migrations for the current environment'
     task :reset => ["db:drop", "db:create", "db:migrate"]
 
@@ -120,20 +119,6 @@ namespace :db do
     Rake::Task["db:schema:dump"].invoke unless Rails.env.test?
   end
 
-  desc 'Rolls the schema back to the previous version. Specify the number of steps with STEP=n'
-  task :rollback => "migrate:load" do
-    step = ENV['STEP'] ? ENV['STEP'].to_i : 1
-    Sequel::Migrator.rollback('db/migrate/', step)
-    Rake::Task["db:schema:dump"].invoke unless Rails.env.test?
-  end
-
-  desc 'Pushes the schema to the next version. Specify the number of steps with STEP=n'
-  task :forward => "migrate:load" do
-    step = ENV['STEP'] ? ENV['STEP'].to_i : 1
-    Sequel::Migrator.forward('db/migrate/', step)
-    Rake::Task["db:schema:dump"].invoke unless Rails.env.test?
-  end
-
   desc 'Load the seed data from db/seeds.rb'
   task :seed => :abort_if_pending_migrations do
     seed_file = File.join(Rails.root, 'db', 'seeds.rb')