Updating the tutorial file (#907)

* Delete examples/binary_segmentation_intro.ipynb

* Delete examples/cars segmentation (camvid).ipynb

* Add files via upload

* Add files via upload

* Update hub_mixin.py

* Add files via upload

* Delete examples/binary-segmentation-intro.ipynb

* Add files via upload

* Restore the hub_mixin.py file

* Add files via upload

* Delete examples/cars segmentation (camvid).ipynb.ipynb

* Update cars segmentation (camvid).ipynb

import albumentations as albu -> import albumentations as A
# 训练集增强策略 -> # training set images augmentation

Author: ytzfhqs