Added 20 sets to [DGC] Collection

Previews & DDL:

	[DGC] 2011.10 No.981 Megumi Suzumoto 涼本めぐみ
	[DGC] 2011.11 No.982 Kaho Takashima 高嶋香帆
	[DGC] 2011.11 No.983 Mina Asakura 麻倉みな
	[DGC] 2011.11 No.984 Yuria Satomi 里美ゆりあ
	[DGC] 2011.11 No.985 Nana Aida 愛田奈々
	[DGC] 2011.11 No.986 Mirei Naitoh 内藤ミレイ
	[DGC] 2011.12 No.987 Ayaka Sayama 佐山彩香
	[DGC] 2011.12 No.988 Fumina Suzuki 鈴木ふみ奈
	[DGC] 2011.12 No.989 Rio Sugawara 菅原梨央
	[DGC] 2011.12 No.990 Rio Sakura 桜りお
	[DGC] 2011.12 No.991 Misuzu Takashima 高嶋美鈴
	[DGC] 2011.12 No.992 Ran Sakai 酒井蘭
	[DGC] 2012.01 No.993 Misaki Nito 仁藤みさき
	[DGC] 2012.01 No.994 Yuu Tejima 手島優
	[DGC] 2012.01 No.995 Yuri Morishita 森下悠里
	[DGC] 2012.01 No.996 Mikako Horikawa 堀川美加子
	[DGC] 2012.01 No.997 Yu Asakura 麻倉憂
	[DGC] 2012.01 No.998 Kana Tsuruta 鶴田かな
	[DGC] 2012.02 No.999 Risa Yoshiki 吉木りさ
	[DGC] 2012.02 No.1000 Anna Nakagawa 中川杏奈