Added various new 1.9 entities, blocks and items

src/main/java/org/bukkit/entity/EnderSignal.java

@@ -0,0 +1,8 @@
+package org.bukkit.entity;
+
+/**
+ * Represents an Ender Signal, which is often created upon throwing an ender eye
+ */
+public interface EnderSignal extends Entity {
+    
+}