Improve filter callback

src/plugin/deep.js

@@ -0,0 +1,18 @@
+function deepFind(obj, path) {
+    var paths = path.split('.')
+      , current = obj
+      , i;
+  
+    for (i = 0; i < paths.length; ++i) {
+      if (current[paths[i]] == undefined) {
+        return undefined;
+      } else {
+        current = current[paths[i]];
+      }
+    }
+    return current;
+}
+  
+module.exports = {
+    deepFind: deepFind,
+};