Exultant/bottleO — pull request #13 by fndragon (2013-03-05 02:54:24+00:00)
Title: Here is code that will refund glass bottles from EXP bottles and emeralds / emerald blocks.

Two parts to this commit. If you use an emerald or emerald block, this will generate
the equivalent # of empty bottles to the amount of xp generated.

If you right-click on an enchanting table with EXP_BOTTLES, it will give
the player the XP inside of the bottle, as well as replacing the exp
bottles with empty glass_bottles.