Renamed nomenclature to Demonic Will instead of souls - still missing a few spots

src/main/java/WayofTime/bloodmagic/api/soul/IDemonWillGem.java

@@ -0,0 +1,32 @@
+package WayofTime.bloodmagic.api.soul;
+
+import net.minecraft.item.ItemStack;
+
+public interface IDemonWillGem
+{
+    /**
+     * 
+     * @param willGemStack
+     *        - The ItemStack for this demon will gem.
+     * @param willStack
+     *        - The ItemStack for the will. Item should extend IDemonWill
+     * @return - The remainder willStack after the will has been absorbed into
+     *         the gem. Return null if there is no will left in the stack.
+     */
+    public ItemStack fillDemonWillGem(ItemStack willGemStack, ItemStack willStack);
+
+    /**
+     * Returns the number of souls that are left in the soul gem. Returns a
+     * double because souls can be fractionally drained.
+     * 
+     * @param willGemStack
+     * @return
+     */
+    public double getWill(ItemStack willGemStack);
+
+    public void setWill(ItemStack willGemStack, double amount);
+
+    public int getMaxWill(ItemStack willGemStack);
+
+    public double drainWill(ItemStack stack, double drainAmount);
+}