Merge pull request #8 from KazumaKobayashi/develop

エラーが出ないように修正
Merge pull request #9 from KazumaKobayashi/develop

Add regist logic.
Merge pull request #10 from KazumaKobayashi/develop

Hash password
Merge pull request #11 from KazumaKobayashi/develop

ログイン機能の実装
Merge pull request #12 from KazumaKobayashi/develop

ログイントークン発行関係の追加
Merge pull request #13 from KazumaKobayashi/develop

リファクタリング
Merge pull request #14 from KazumaKobayashi/develop

ログイントークンのフィルターを追加
Merge pull request #19 from KazumaKobayashi/develop

コメントの追加
Merge pull request #21 from KazumaKobayashi/develop

ユーザ関係の実装
small refactor
Merge pull request #27 from KazumaKobayashi/master

余計なものを削除