caffe2paddle, add relu6/upsample layer，support LeakReLU，repair axpy/dropout

caffe_custom_layer.md

-目前，代码中已经提供了8个非官方op（不在[官网](http://caffe.berkeleyvision.org/tutorial/layers)上的op）的转换，这些op对应的Caffe实现源码如下：
+目前，代码中已经提供了10个非官方op（不在[官网](http://caffe.berkeleyvision.org/tutorial/layers)上的op）的转换，这些op对应的Caffe实现源码如下：
 
 | op | 该版本实现源码 |
 |-------|--------|
@@ -10,3 +10,5 @@
 | Normalize | [code](https://github.com/weiliu89/caffe/blob/ssd/src/caffe/layers/normalize_layer.cpp) |
 | ROIPooling | [code](https://github.com/rbgirshick/caffe-fast-rcnn/blob/0dcd397b29507b8314e252e850518c5695efbb83/src/caffe/layers/roi_pooling_layer.cpp) |
 | Axpy | [code](https://github.com/hujie-frank/SENet/blob/master/src/caffe/layers/axpy_layer.cpp) |
+| ReLU6 | [code](https://github.com/chuanqi305/ssd/blob/ssd/src/caffe/layers/relu6_layer.cpp) |
+| Upsample | [code](https://github.com/eric612/MobileNet-YOLO/blob/master/src/caffe/layers/upsample_layer.cpp) |
\ No newline at end of file

x2paddle_model_zoo.md

@@ -33,6 +33,8 @@
 | MobileNet_V1 | [code](https://github.com/shicai/MobileNet-Caffe) |
 | MobileNet_V2 | [code](https://github.com/shicai/MobileNet-Caffe) |
 | ShuffleNet_v2 | [code](https://github.com/miaow1988/ShuffleNet_V2_pytorch_caffe/releases/tag/v0.1.0) |
+| InceptionV3 | [code](https://github.com/soeaver/caffe-model/blob/master/cls/inception/) |
+| InceptionV4 | [code](https://github.com/soeaver/caffe-model/blob/master/cls/inception/) |
 | mNASNet | [code](https://github.com/LiJianfei06/MnasNet-caffe) |
 | MTCNN | [code](https://github.com/kpzhang93/MTCNN_face_detection_alignment/tree/master/code/codes/MTCNNv1/model) |
 | Mobilenet_SSD | [code](https://github.com/chuanqi305/MobileNet-SSD) |