Added 20 sets to [DGC] Collection

Previews & DDL:

	[DGC] 2006.07 No.301 Kana Tsugihara 次原かな
	[DGC] 2006.07 No.302 Saori Tashiro 田代沙織
	[DGC] 2006.07 No.303 Riko Tachibana 立花里子
	[DGC] 2006.07 No.304 Miho Maejima 前嶋美歩
	[DGC] 2006.07 No.305 Minase Yashiro 八代みなせ
	[DGC] 2006.07 No.306 Yoshimi Yoshimochi 吉用由美
	[DGC] 2006.07 No.307 Rion Sakamoto 坂本りおん
	[DGC] 2006.07 No.308 Rika Takahashi 高橋りか
	[DGC] 2006.07 No.309 Hana 花菜
	[DGC] 2006.07 No.310 Moe Takahara 高原もえ
	[DGC] 2006.08 No.311 Azusa Yamamoto 山本梓
	[DGC] 2006.08 No.312 Ai 愛衣
	[DGC] 2006.08 No.313 Chise Nakamura 中村知世
	[DGC] 2006.08 No.314 Arisa Oda 小田有紗
	[DGC] 2006.08 No.315 Natsuki Yoshihara 吉原夏紀
	[DGC] 2006.08 No.316 Shoko Shibata 芝田翔生子
	[DGC] 2006.08 No.317 Chiharu Sugimoto 杉本知春
	[DGC] 2006.08 No.318 Mine Nayuka 峰なゆか
	[DGC] 2006.08 No.319 Reina Matsushima 松嶋れいな
	[DGC] 2006.08 No.320 Megumi Sugiyama 杉山めぐみ