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/ServerInterface.java

@@ -51,6 +51,13 @@ public abstract class ServerInterface {
      */
     public abstract void reload();
 
+    /**
+     * Returns all available biomes.
+     *
+     * @return
+     */
+    public abstract BiomeTypes getBiomes();
+
     /**
      * Schedules the given <code>task</code> to be invoked once every <code>period</code> ticks
      * after an initial delay of <code>delay</code> ticks.