Fix ruby-version to 2.1.5
Update to Rails 4.1.8
Remove empty files./Arrange application settings.
Setup for Heroku.
Setup new relic.
Organize heroku.yml.
Create staging.rb.
Setup secret key base for staging.
Merge pull request #46 from JunichiIto/fix-version

RubyとRailsのバージョンを指定 & Gemfile のコメントアウト削除
Install RSpec.
Add user spec.
Add feature spec.
Merge pull request #47 from JunichiIto/devenv-setup

開発環境セットアップ
Use rails config.
Add sample yaml.
Merge pull request #48 from JunichiIto/use-rails-config

Use rails config
Refactoring spec.
Add tags spec.
Delete unused action.
Merge pull request #49 from JunichiIto/tags-spec

Tag関連のテストを追加