VanillaDev/Vanilla — pull request #293 by R-T-B (2012-08-16 04:10:30+00:00)
Title: Fixed many block drops to match Vanilla gameplay.

Many common items, such as grass, did not clear the default drop table
before adding their actual drop (dirt in grass's case) I fixed such
errors where neccesary, and added approprate drop "clear" and "add"
methods to all of the files in this commit (including adding special
VanillaMaterials for SilkTouch, may have missed a few, check).

Signed-off-by: Raymond Beehler <21GunSoftware@comcast.net>