Green thumb now converts cobble walls to mossy cobble walls.

src/main/java/com/gmail/nossr50/util/BlockChecks.java

@@ -154,6 +154,7 @@ public class BlockChecks {
         case DIRT:
             return true;
         case SMOOTH_BRICK:
+        case COBBLE_WALL:
             if (block.getData() == 0) {
                 return true;
             }