TensorRT的Prelu层

# TensorRT-Prelu This code is sample to implement PReLU and Slice layer. The code has been tested by myself, it can help you learn about TensorRT API fast! ## requirmets: *1.TensorRT 4.0.1 *2.Cuda8.0 / Cuda9.0 and Cudnn 7.1 *3.OpenCV ## about TensorRT PReLU layer PReLU layer has been supported officially, but it is Leaky ReLU layer actually!!!