caffe 保存blob值到txt，方便查看和pytorch比较

在blob.hpp添加函数：

void save_data_to_txt(const string path_txt, bool b_save_shape = true)
    {
        std::ofstream fOut(path_txt);
        if (!fOut)
        {
            std::cout << "Open output file faild." << std::endl;
        }
        if(b_save_shape)
        {
            for(int i=0;i();
        for (int i = 0; i < count_; ++i) {
            fOut << data_vec[i] << std::endl;
        }
        fOut.close();
    }

会在本地生成blob值，如下示例：

1,2,3,9
0.296902
0.219784
0.411638
0.260122
0.381804
0.226767
0.34326
0.431977
0.442307
0.494072
0.328519
0.396156
0.480086
0.379205
0.577999
0.436218
0.503253
0.458271
0.49964
0.202944
0.267732
0.188421
0.293444