Start of update() + added sign

src/main/java/org/bukkit/craftbukkit/block/CraftSign.java

@@ -0,0 +1,27 @@
+
+package org.bukkit.craftbukkit.block;
+
+import org.bukkit.Block;
+import org.bukkit.Chunk;
+import org.bukkit.Material;
+import org.bukkit.World;
+import org.bukkit.block.Sign;
+import org.bukkit.craftbukkit.CraftWorld;
+
+public class CraftSign extends CraftBlockState implements Sign {
+    public CraftSign(final CraftWorld world, final int x, final int y, final int z, final int type, final byte data) {
+        super(world, x, y, z, type, data);
+    }
+
+    public String[] getLines() {
+        throw new UnsupportedOperationException("Not supported yet.");
+    }
+
+    public String getLine(int index) throws IndexOutOfBoundsException {
+        throw new UnsupportedOperationException("Not supported yet.");
+    }
+
+    public void setLine(int index, String line) throws IndexOutOfBoundsException {
+        throw new UnsupportedOperationException("Not supported yet.");
+    }
+}