Added EntityRegainHealthEvent. Thanks TimWolla!

src/main/java/org/bukkit/event/entity/EntityListener.java

@@ -39,4 +39,6 @@ public class EntityListener implements Listener {
     public void onCreeperPower(CreeperPowerEvent event) {}
 
     public void onEntityTame(EntityTameEvent event) {}
+
+    public void onEntityRegainHealth(EntityRegainHealthEvent event) {}
 }

src/main/java/org/bukkit/event/entity/EntityRegainHealthEvent.java

@@ -0,0 +1,68 @@
+package org.bukkit.event.entity;
+
+import org.bukkit.entity.Entity;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.Event;
+
+/**
+ * Stores data for health-regain events
+ */
+public class EntityRegainHealthEvent extends EntityEvent implements Cancellable {
+
+    private boolean cancelled;
+    private int amount;
+
+    public EntityRegainHealthEvent(Entity entity, int amount)
+    {
+        super(Event.Type.ENTITY_REGAIN_HEALTH, entity);
+        this.amount = amount;
+    }
+
+    protected EntityRegainHealthEvent(Event.Type type, Entity entity, int amount)
+    {
+        super(type, entity);
+        this.amount = amount;
+    }
+
+    /**
+     * Gets the amount of regained health
+     * @return The amount of health regained
+     */
+    public int getAmount()
+    {
+        return amount;
+    }
+
+    /**
+     * Sets the amount of regained health
+     */
+    public void setAmount(int amount) {
+        this.amount = amount;
+    }
+
+    /**
+     * Gets the cancellation state of this event. A cancelled event will not
+     * be executed in the server, but will still pass to other plugins
+     *
+     * If a health-regain event is cancelled, the entity won't get health.
+     * This will not fire an event.
+     *
+     * @return true if this event is cancelled
+     */
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    /**
+     * Sets the cancellation state of this event. A cancelled event will not
+     * be executed in the server, but will still pass to other plugins
+     *
+     * If a health-regain event is cancelled, the entity won't get health.
+     * This will not fire an event.
+     *
+     * @param cancel true if you wish to cancel this event
+     */
+    public void setCancelled(boolean cancel) {
+        cancelled = cancel;
+    }
+}