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たぶんこれでgem化できると思います。ただhttps://rubygems.orgに登録するにはご自身でhttps://rubygems.orgにアカウントを作成していただいてプッシュする必要があります。
詳しくはここをご参照ください。
http://dgames.jp/dan/permalink/20110619
あと細かい点ですが、gemの名前を大文字で始まるのはあまり見た事ないので名前は"drip"にしておきました。ちょっとgithub名とgem名が違うのがすこしややこしいかもしれませんが。