added a relativePath() method

system/src/Grav/Common/Page/Medium/Medium.php

@@ -146,6 +146,21 @@ class Medium extends Data implements RenderableInterface
         return $this->get('filepath');
     }
 
+    /**
+     * Return the relative path to file
+     *
+     * @param bool $reset
+     * @return mixed
+     */
+    public function relativePath($reset = true)
+    {
+        if ($reset) {
+            $this->reset();
+        }
+
+        return str_replace(GRAV_ROOT, '', $this->get('filepath'));
+    }
+
     /**
      * Return URL to file.
      *