Fill in various missing documentation

src/main/java/com/minelittlepony/model/armour/IArmorTextureResolver.java

@@ -11,5 +11,8 @@ import javax.annotation.Nullable;
 
 public interface IArmorTextureResolver<T extends EntityLivingBase> {
 
+    /**
+     * Gets the armour texture to be used for the given entity, armour piece, slot, and render layer.
+     */
     ResourceLocation getArmorTexture(T entity, ItemStack itemstack, EntityEquipmentSlot slot, ArmorLayer layer,  @Nullable String type);
 }

src/main/java/com/minelittlepony/model/armour/IEquestrianArmor.java

@@ -6,10 +6,22 @@ import com.minelittlepony.model.capabilities.IModelArmor;
 import com.minelittlepony.model.capabilities.IModelWrapper;
 
 public interface IEquestrianArmor<V extends ModelBiped & IModelArmor> extends IModelWrapper {
+    /**
+     * Gets the armour model to render for the given layer.
+     */
     V getArmorForLayer(ArmorLayer layer);
 
+    /**
+     * The layer used to render a given armour piece.
+     */
     enum ArmorLayer {
+        /**
+         * Fits snugly to the player's model.
+         */
         INNER,
+        /**
+         * Hanging loose and sagging free
+         */
         OUTER
     }
 }

src/main/java/com/minelittlepony/model/capabilities/IModel.java

@@ -20,6 +20,9 @@ public interface IModel extends ICapitated {
      */
     void transform(BodyPart part);
 
+    /**
+     * Gets the active scaling profile used to lay out this model's parts.
+     */
     PonySize getSize();
 
     /**
@@ -27,6 +30,9 @@ public interface IModel extends ICapitated {
      */
     IEquestrianArmor<?> createArmour();
 
+    /**
+     * Gets the skin metadata associated with this model.
+     */
     IPonyData getMetadata();
 
     /**
@@ -77,12 +83,24 @@ public interface IModel extends ICapitated {
      */
     boolean isChild();
 
+    /**
+     * Gets the current leg swing amount.
+     */
     float getSwingAmount();
 
+    /**
+     * Gets the y-offset applied to entities riding this one.
+     */
     float getRiderYOffset();
 
+    /**
+     * Gets the actual, visible height of this model when rendered.
+     */
     float getModelHeight();
 
+    /**
+     * Tests if this model is wearing the given piece of gear.
+     */
     default boolean isWearing(PonyWearable wearable) {
         return getMetadata().isWearing(wearable);
     }

src/main/java/com/minelittlepony/model/capabilities/IModelPart.java

@@ -17,7 +17,7 @@ public interface IModelPart {
      */
     default void setRotationAndAngles(boolean rainboom, float move, float swing, float bodySwing, float ticks) {
 
-    };
+    }
 
     /**
      * Renders this model component.

src/main/java/com/minelittlepony/model/capabilities/IModelPegasus.java

@@ -14,7 +14,11 @@ public interface IModelPegasus extends IModel {
         return (isSwimming() || isFlying() || isCrouching()) && !isElytraFlying();
     }
 
-
+    /**
+     * Determines angle used to animate wing flaps whilst flying/swimming.
+     *
+     * @param ticks Partial render ticks
+     */
     default float getWingRotationFactor(float ticks) {
         if (isSwimming()) {
             return (MathHelper.sin(ticks * 0.136f) / 2) + ROTATE_270;

src/main/java/com/minelittlepony/model/capabilities/IModelUnicorn.java

@@ -5,6 +5,9 @@ import net.minecraft.util.EnumHandSide;
 import com.minelittlepony.render.model.PonyRenderer;
 
 public interface IModelUnicorn extends IModel {
+    /**
+     * Gets the arm used for holding items in their magic.
+     */
     PonyRenderer getUnicornArmForSide(EnumHandSide side);
 
     /**