add uuid property to prefab, rename prototype to parent

untests/bin/library/parent.json

@@ -0,0 +1,12 @@
+{
+    "uuid" : "73740BC4-CE9F-4A7F-A029-4AB65027A8AE",
+    "components" : {
+        "named" : {
+            "name" : "parent"
+        },
+        "circle_collider" : {
+            "radius" : 5,
+            "offset" : [4,2]
+        }
+    }
+}

untests/bin/library/prefab.json

@@ -1,17 +1,13 @@
 {
+    "parent" : "prototype.json",
     "components" : {
-        "touchable" : {},
-
+        "named" : {
+            "name" : "prefab"
+        },
         "rect_collider" : {
             "size" : [1,2],
             "offset" : [2,4]
         },
-
-        "circle_collider" : {
-            "radius" : 5,
-            "offset" : [4,2]
-        },
-
         "polygon_collider" : {
             "points" : [[1,2],[2,3],[3,4]],
             "offset" : [8,4]