fix  #667 format files

issue 658,fix test_gemm.cpp

update FPGA api

fix:#663

created fpga concat op:#647

change clang to gcc in android cross-compilation

issue #658, fix test_gemm.c to check sgemmwithbn

fix #651  add con add bn relu op test, modify executor for test

add FPGA interfaces

optimize gemm

增加可被x86编译运行的量化脚本,并增加量化脚本说明文档.