* Add full configs example & refine doc

* refine docs

* add_ssd_config_demo

update readme

Make support for variable height.
1. Fix readme in ocr model.
2. Fix data reader to support variable shape of input.

* add_license for PaddleCV

* update license date

* update GAN license date

* update gan0727

* Add cascade deformable mdoels
* Fix MODLE_ZOO.md

# Add VGG-SSD on VOC and COCO dataset.
# Add config and model zoo. 
# Refine bbox2out and draw_bbox:
    - Add bbox de-normalize in bbox2out function.
    - Remove bbox de-normalize in draw_bbox.

* update doc in PaddleDetection

* refine weight download

* fix comment

Add UNet method of AGE challenge baseline

* add save best model & fix dcn configs

* fix yolov3 voc eval in train

* fix comment

* standard SENet and add a warning in coco loader

change set to list in c_gan

* AGE challenge baseline

* update gan model

* update gan model time display

* update gan script

* update gan script

* add densenet, squeezenet, darknet, resnext, resnext101_wsl pretrained models

* add deformable models
* fix dcn v2
* fix log_iter

* fix cn docs

* fix ssd eval_coco_map bug

* fix easy problem

* update GETTING_STARTED.md