Add iterator in PathSet for superset and subset combination

lib/path-set.js

@@ -111,6 +111,15 @@ class PathSet {
   }
 
 
+  *all(path, depth) {
+    var p = path.slice();
+    for (let i = 0; i < p.length; ++ i)
+      if (p[i] === '*')
+        p[i] = null;
+    yield* this.find(p, depth || 0, true);
+  }
+
+
   *find(pattern, depth, wildcard) {
     var sets = [];