Tell the player that their game mode was changed

Resolves https://github.com/GlowstoneMC/Glowstone/issues/397
Updated Enchanting inventory to include new slot.
Added cause-specific damage methods to Damageable.
Fixed facing methods for fence gates.
Updated magic values for Skull directions.

Minecraft 1.8 switches the representations of east and west.
Added API for manipulating banners and banner patterns.

Banner blocks have facing, base color, and pattern. Banner patterns are a
list of layers, which have a shape and color.
Add 1.8 LivingEntities.