Added HDSkins (and by extension Kirin) as a dependency to Mine Little Pony. Fingers crossed this works.

.gitmodules

@@ -2,3 +2,7 @@
 	path = skins
 	url = https://github.com/MineLittlePony/Community-Skin-Pack.git
 	branch = master
+[submodule "hdskins"]
+  path = hdskins
+	url = https://github.com/MineLittlePony/HDSkins.git
+	branch = 1.13

build.gradle

@@ -110,6 +110,10 @@ dependencies {
     compile('org.spongepowered:mixin:0.7.11-SNAPSHOT') {
         transitive = false
     }
+
+    compile project(':hdskins') {
+        transitive = false
+    }
 }
 
 manifest {

hdskins

@@ -0,0 +1 @@
+Subproject commit f616a288842af3334090bc0cec56f18f851adbb2