Added clear() methods to JSONObject and JSONArray

src/main/java/org/json/JSONArray.java

@@ -567,6 +567,14 @@ public class JSONArray implements Iterable<Object> {
         return this.myArrayList.size();
     }
 
+    /**
+     * Removes all of the elements from this JSONArray.
+     * The JSONArray will be empty after this call returns.
+     */
+    public void clear() {
+        return this.map.clear();
+    }
+
     /**
      * Get the optional object value associated with an index.
      *