Add view

http://mobiletou.ch/2013/10/rubymotion-qiita%E3%81%AA%E3%82%A2%E3%83%97%E3%83%AA%E3%82%92%E4%BD%9C%E3%82%8D%E3%81%86-2
Refactor

http://mobiletou.ch/2013/10/rubymotion%E3%81%A7%E3%83%AA%E3%83%95%E3%82%A1%E3%82%AF%E3%82%BF%E3%83%AA%E3%83%B3%E3%82%B0%E3%80%82mvc%E3%81%AE%E5%88%86%E9%9B%A2%E3%81%AB%E3%83%81%E3%83%A3%E3%83%AC%E3%83%B3%E3%82%B8%EF%BC%81
Refactor using model
Refactor using controllers/entry_controller.rb and views/entry_cell.rb
Add model specs