Add biome support

Add a BiomeTypes interface
Add methods in ServerInterface to retrieve the implemented BiomeTypes
Add a getBiome method to LocalWorld and subclasses
Add /biomeinfo & /biomelist commands
Add a BiomeTypeMask
Closes #181

src/main/java/com/sk89q/worldedit/masks/BiomeTypeMask.java

@@ -0,0 +1,27 @@
+package com.sk89q.worldedit.masks;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import com.sk89q.worldedit.BiomeType;
+import com.sk89q.worldedit.EditSession;
+import com.sk89q.worldedit.Vector;
+
+public class BiomeTypeMask implements Mask {
+
+    private Set<BiomeType> biomes;
+
+    public BiomeTypeMask() {
+        this(new HashSet<BiomeType>());
+    }
+
+    public BiomeTypeMask(Set<BiomeType> biomes) {
+        this.biomes = biomes;
+    }
+
+    public boolean matches(EditSession editSession, Vector pos) {
+        BiomeType biome = editSession.getWorld().getBiome(pos.toVector2D());
+        return biomes.contains(biome);
+    }
+
+}