Update from upstream SpigotMC

Fix double plants having the incorrect top half SpigotMC/Spigot@377b69d787
Fix boats thinking that they were always on land for 1.8 clients SpigotMC/Spigot@4a083f819e
Correct the action used in updateGamemode. this isn't used by the ser... SpigotMC/Spigot@face904a9a
Allow the updated version of protocollib to be enabled SpigotMC/Spigot@4614a615cc

Bukkit-Patches/0031-Skip-loading-of-ProtocolLib-and-Orebfuscator.patch

@@ -14,7 +14,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
                  description = loader.getPluginDescription(file);
                  String name = description.getName();
 +                // Spigot Start
-+                if ( name.equalsIgnoreCase( "ProtocolLib" ) )
++                if ( name.equalsIgnoreCase( "ProtocolLib" ) && !description.getVersion().endsWith( "-HACK" ) )
 +                {
 +                    server.getLogger().log( Level.WARNING, "Skipping loading of ProtocolLib as it does not work with Spigot 1.8 builds!" );
 +                    continue;