Add skip backup parameter to delete folder api

Author: adimiz1

cloudinary-core/src/main/java/com/cloudinary/Api.java

@@ -660,8 +660,10 @@ public ApiResponse updateResourcesAccessModeByTag(String accessMode, String tag,
      * @throws Exception When the folder isn't empty or doesn't exist.
      */
     public ApiResponse deleteFolder(String folder, Map options) throws Exception {
+        if (options == null || options.isEmpty()) options = ObjectUtils.asMap();
         List<String> uri = Arrays.asList("folders", folder);
-        return callApi(HttpMethod.DELETE, uri, Collections.<String, Object>emptyMap(), options);
+        Map params = ObjectUtils.only(options, "skip_backup");
+        return callApi(HttpMethod.DELETE, uri, params, options);
     }
 
     /**

cloudinary-test-common/src/main/java/com/cloudinary/test/AbstractFoldersApiTest.java

@@ -85,4 +85,17 @@ public void testSubFolderWithParams() throws Exception {
         ApiResponse result = api.deleteFolder(rootFolderName, null);
         assertTrue(((List) result.get("deleted")).contains(rootFolderName));
     }
+
+    @Test
+    public void testDeleteFolderWithSkipBackup() throws Exception {
+        //Create
+        String rootFolderName = "deleteFolderWithSkipBackup" + SUFFIX;
+        assertTrue((Boolean) api.createFolder(rootFolderName, null).get("success"));
+
+        //Delete
+        ApiResponse result = api.deleteFolder(rootFolderName, ObjectUtils.asMap("skip_backup", "true"));
+        assertTrue(((List) result.get("deleted")).contains(rootFolderName));
+
+
+    }
 }