Add jquery-ui-rails to assets requirements
Use slim to form partial template
Use tag-it to select tagging interface
Add config/database.yml.sample
Add Rake task which create config/database.yml
Generate config/database.yml before run db:setup
Run db:migrate and db:create instead of db:setup
Merge pull request #11 from aereal/feature/rich-tagging

タグの編集インターフェースをもうすこしリッチにする