Adjusted some of the cycler code and added a test case for it.

- Added range checks for most blocks
- torches: Fixed cycle from 0->1->2->3->0 to 1->2->3->4->1
- mushroom caps: Included data value 10 (stem) in cycle
- vines: Included data value 0 (top attachment only) in the cycle
- furnaces/dispensers: Linearised the cycle. It's now 2->3->4->5->2
- chests/ladders: Added cycle code.
- rails: Linearised the cycle. It's now 6->7->8->9->6

src/test/java/com/sk89q/worldedit/data/BlockDataTest.java

@@ -22,12 +22,13 @@ package com.sk89q.worldedit.data;
 import org.junit.*;
 
 import com.sk89q.worldedit.CuboidClipboard.FlipDirection;
+import com.sk89q.worldedit.blocks.BlockID;
 
 import static org.junit.Assert.*;
 
 public class BlockDataTest {
     @Test
-    public void testSlice() {
+    public void testRotateFlip() {
         for (int type = 0; type < 256; ++type) {
             for (int data = 0; data < 16; ++data) {
                 final String message = type+"/"+data;
@@ -46,4 +47,24 @@ public class BlockDataTest {
             }
         }
     }
+
+    @Test
+    public void testCycle() {
+        for (int type = 0; type < 256; ++type) {
+            if (type == BlockID.CLOTH)
+                continue;
+
+            for (int data = 0; data < 16; ++data) {
+                final String message = type+"/"+data;
+
+                int cycled = BlockData.cycle(type, data, 1);
+
+                if (cycled <= data) {
+                    continue;
+                }
+
+                assertEquals(message, data+1, cycled); 
+            }
+        }
+    }
 }