Add get friends url. Fixed #88
Fixed #83
Change initialize value. fixed #91
Remove friend objects. fixed #90
Add friend relating and friend related lists. fixed #89
Merge pull request #94 from KazumaKobayashi/friend

フレンド関係の追加
Merge pull request #95 from KazumaKobayashi/coordinate

バグ修正や必須機能の追加