Add implementation of the elder Guardian API

By: md_5 <git@md-5.net>

paper-server/nms-patches/EntityAgeable.patch

@@ -1,5 +1,5 @@
---- ../work/decompile-8eb82bde//net/minecraft/server/EntityAgeable.java	2014-11-28 17:43:43.061707436 +0000
-+++ src/main/java/net/minecraft/server/EntityAgeable.java	2014-11-28 17:38:22.000000000 +0000
+--- ../work/decompile-8eb82bde//net/minecraft/server/EntityAgeable.java	Thu Dec  4 19:00:43 2014
++++ src/main/java/net/minecraft/server/EntityAgeable.java	Thu Dec  4 18:45:16 2014
 @@ -7,6 +7,7 @@
      protected int c;
      private float bk = -1.0F;
@@ -46,3 +46,12 @@
              if (this.c > 0) {
                  if (this.c % 4 == 0) {
                      this.world.addParticle(EnumParticle.VILLAGER_HAPPY, this.locX + (double) (this.random.nextFloat() * this.width * 2.0F) - (double) this.width, this.locY + 0.5D + (double) (this.random.nextFloat() * this.length), this.locZ + (double) (this.random.nextFloat() * this.width * 2.0F) - (double) this.width, 0.0D, 0.0D, 0.0D, new int[0]);
+@@ -146,7 +149,7 @@
+         this.a(flag ? 0.5F : 1.0F);
+     }
+ 
+-    protected final void a(float f, float f1) {
++    public final void a(float f, float f1) { // CraftBukkit - protected to public
+         boolean flag = this.bk > 0.0F;
+ 
+         this.bk = f;