SPIGOT-447: Fix dismount causing a quick remount

nms-patches/EntityPlayer.patch

@@ -1,5 +1,5 @@
---- ../work/decompile-8eb82bde/net/minecraft/server/EntityPlayer.java	2015-01-09 16:51:30.962362579 +1100
-+++ src/main/java/net/minecraft/server/EntityPlayer.java	2015-01-09 16:51:30.962362579 +1100
+--- ../work/decompile-8eb82bde/net/minecraft/server/EntityPlayer.java	2015-02-20 15:35:53.244364933 +1100
++++ src/main/java/net/minecraft/server/EntityPlayer.java	2015-02-20 15:35:53.248364925 +1100
 @@ -13,6 +13,17 @@
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
@@ -289,6 +289,15 @@
          if (this.isSleeping()) {
              this.u().getTracker().sendPacketToEntity(this, new PacketPlayOutAnimation(this, 2));
          }
+@@ -457,7 +569,7 @@
+         Entity entity1 = this.vehicle;
+ 
+         super.mount(entity);
+-        if (entity != entity1) {
++        if (this.vehicle != entity1) { // CraftBukkit
+             this.playerConnection.sendPacket(new PacketPlayOutAttachEntity(0, this, this.vehicle));
+             this.playerConnection.a(this.locX, this.locY, this.locZ, this.yaw, this.pitch);
+         }
 @@ -490,19 +602,46 @@
          this.playerConnection.sendPacket(new PacketPlayOutOpenSignEditor(tileentitysign.getPosition()));
      }