Read through caching library inspired by Cache Money, support Sequel 4 Read-Through: Queries by ID or any specified unique key, like `User[params[:id]]` or `User[username: 'bachue@gmail.com']`, will first look in memcache store and then look in the database for the results of that query. If there is a cache miss, it will populate the cache. As objects are created, updated, and deleted, all of the caches are automatically expired.