Correct FPGA track concat_kernel.cpp , close #730

add jni method for multithread , resolved #732

fix #727 commit conv transpose

Update README.md

Update README.md

PaddleMobile OPENMP  第一个多线程版本

implement multithreading 3x3 s1 depthwise_conv

add empty function in Gemm for compilation of other platform

update added FPGA kernels to support quantization #closed 716

register Feed and Fetch ops. Close #714

update enforce rule

add gemm merge function: C = A * B + bias