Added 20 sets to [DGC] Collection

Previews & DDL:

	[DGC] 2011.04 No.941 Suzune Toyama 遠山涼音
	[DGC] 2011.05 No.942 Aki Hoshino ほしのあき
	[DGC] 2011.05 No.943 Fumina Suzuki 鈴木ふみ奈
	[DGC] 2011.05 No.944 Marina Saito 斎藤眞利奈
	[DGC] 2011.05 No.945 Asuka Hoshino ほしのあすか
	[DGC] 2011.05 No.946 Jessica Kizaki 希崎ジェシカ
	[DGC] 2011.05 No.947 Ai Haneda 羽田あい
	[DGC] 2011.05 No.948 Tomoyo Hoshino ほしの智世
	[DGC] 2011.06 No.949 Yuri Murakami 村上友梨
	[DGC] 2011.06 No.950 Marika Minami 南まりか
	[DGC] 2011.06 No.951 Natsumi Kamada 鎌田奈津美
	[DGC] 2011.06 No.952 Hikari Shina 椎名ひかる
	[DGC] 2011.06 No.953 Aino Kishi 希志あいの
	[DGC] 2011.06 No.954 Kaho Kasumi かすみ果穂
	[DGC] 2011.06 No.955 Maaya 真亜也
	[DGC] 2011.07 No.956 Maomi Yuuki 優木まおみ
	[DGC] 2011.07 No.957 Erina Matsui 松井絵里奈
	[DGC] 2011.07 No.958 Yuki Mogami 最上ゆき
	[DGC] 2011.07 No.959 An Shinohara 篠原杏
	[DGC] 2011.07 No.960 Ai Sayama 佐山愛