Migration helper not working with Rails 3.2.3

[hasham2]

Migration helper 'userstamps' is not working in Rails 3.2.3, it seems that the t object in create_table and change_table in migration files pass object of ActiveRecord::ConnectionAdapters::TableDefinition type, But this was changed to ActiveRecord::ConnectionAdapters::Table in commit aee44af

[JohnColvin]

Made a pull request for this: #18