add border check in gemm

add openmp support for ios

repair bugs in op kernels for FPGA track close #914

add nlp net supported &&add unittest &&add singlenet build #911

Update to format data for FPGA track close #908

fix #906 compile on ios

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