Added RedundantModifier checkstyle rule.
Implemented buckets.
Implemented basic farming support.

Added placement and interact handling for hoes, wheat, melons, pumpkins,
nether warts, carrots, potatoes, and cocoa beans. No growth ticking yet.
Merge branch 'master' into pr-282

Conflicts:
	src/main/java/net/glowstone/block/ItemTable.java
	src/main/java/net/glowstone/entity/meta/MetadataIndex.java