Add test code for FPGA track close #904

fix PRelu merge operation in Gemm

Format data for FPGA track. close #900

imp fusion_conv_bn_add_relu op in resnet

small clean

Need to format featuremap, filter & bias_scale for FPGA track, add files: close #884

fix bug in pool2d 2x2 math function

repair bug of fusion_fc op

Merge remote-tracking branch 'refs/remotes/upstream/develop' into develop

update the structure of the code of im2col.cpp

update README

update README

separate C = A * B + bias and C = A * B + C in Gemm