Added MaterialData support for SAPPLING, POWERED_RAIL, and DETECTOR_RAIL.

src/main/java/org/bukkit/material/DetectorRail.java

@@ -0,0 +1,32 @@
+package org.bukkit.material;
+
+import org.bukkit.Material;
+
+/**
+ * Represents a detector rail
+ */
+public class DetectorRail extends ExtendedRails implements PressureSensor {
+    public DetectorRail() {
+        super(Material.DETECTOR_RAIL);
+    }
+
+    public DetectorRail(final int type) {
+        super(type);
+    }
+
+    public DetectorRail(final Material type) {
+        super(type);
+    }
+
+    public DetectorRail(final int type, final byte data) {
+        super(type, data);
+    }
+
+    public DetectorRail(final Material type, final byte data) {
+        super(type, data);
+    }
+
+    public boolean isPressed() {
+        return (getData() & 0x8) == 0x8;
+    }
+}