Added 20 sets to [DGC] Collection

Previews & DDL:

	[DGC] 2015.09 No.1261 Aika Yumeno 夢乃あいか
	[DGC] 2015.09 No.1262 Hinata Shizaki 志崎ひなた
	[DGC] 2015.10 No.1263 Anna Nakagawa 中川杏奈
	[DGC] 2015.10 No.1264 Ayaka Noda 野田彩加
	[DGC] 2015.10 No.1265 Misato Shimizu 清水みさと
	[DGC] 2015.10 No.1266 Misuzu Kawana 川菜美鈴
	[DGC] 2015.10 No.1267 Saki Miyamoto 宮本彩希
	[DGC] 2015.10 No.1268 Sumire Nagai 永井すみれ
	[DGC] 2015.11 No.1269 Ai Mahigashi 真東愛
	[DGC] 2015.11 No.1270 Ai Nishida 西田藍
	[DGC] 2015.11 No.1271 Azumi Hirabayashi 平林あずみ
	[DGC] 2015.11 No.1272 Hina Sakurazaki 桜咲ひな
	[DGC] 2015.11 No.1273 Iroha Yanagi 柳いろは
	[DGC] 2015.11 No.1274 Reimi Tachibana 橘麗美
	[DGC] 2015.12 No.1275 Ai Shinozaki 篠崎愛
	[DGC] 2015.12 No.1276 Ayaka Morikawa 森川彩香
	[DGC] 2015.12 No.1277 Azusa Aida 相田あずさ
	[DGC] 2015.12 No.1278 Chika Yuuki 結城ちか
	[DGC] 2015.12 No.1279 Hana Haruna 春菜はな
	[DGC] 2015.12 No.1280 Umi 青海