Add HorseEquipper

src/main/java/net/citizensnpcs/editor/EquipmentEditor.java

@@ -52,6 +52,7 @@ public class EquipmentEditor extends Editor {
         if (equipper == null)
             equipper = new GenericEquipper();
         equipper.equip(event.getPlayer(), npc);
+        event.setCancelled(true);
     }
 
     private static final Map<EntityType, Equipper> EQUIPPERS = Maps.newEnumMap(EntityType.class);
@@ -59,5 +60,6 @@ public class EquipmentEditor extends Editor {
         EQUIPPERS.put(EntityType.PIG, new PigEquipper());
         EQUIPPERS.put(EntityType.SHEEP, new SheepEquipper());
         EQUIPPERS.put(EntityType.ENDERMAN, new EndermanEquipper());
+        EQUIPPERS.put(EntityType.HORSE, new HorseEquipper());
     }
 }

src/main/java/net/citizensnpcs/editor/HorseEquipper.java

@@ -0,0 +1,15 @@
+package net.citizensnpcs.editor;
+
+import net.citizensnpcs.api.npc.NPC;
+import net.citizensnpcs.util.NMS;
+
+import org.bukkit.entity.Horse;
+import org.bukkit.entity.Player;
+
+public class HorseEquipper implements Equipper {
+    @Override
+    public void equip(Player equipper, NPC toEquip) {
+        Horse horse = (Horse) toEquip.getBukkitEntity();
+        NMS.equip(horse, equipper);
+    }
+}

src/main/java/net/citizensnpcs/util/NMS.java

@@ -116,6 +116,10 @@ public class NMS {
         }
     }
 
+    public static void equip(LivingEntity entity, Player equipper) {
+        getHandle(entity).a(NMS.getHandle(equipper));
+    }
+
     private static Constructor<?> getCustomEntityConstructor(Class<?> clazz, EntityType type) throws SecurityException,
             NoSuchMethodException {
         Constructor<?> constructor = ENTITY_CONSTRUCTOR_CACHE.get(clazz);