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/LocalWorld.java

@@ -102,6 +102,14 @@ public abstract class LocalWorld {
      */
     public abstract void setBlockDataFast(Vector pt, int data);
 
+    /**
+     * Get biome type
+     *
+     * @param pt
+     * @return
+     */
+    public abstract BiomeType getBiome(Vector2D pt);
+
     /**
      * set block type & data
      * @param pt