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.

add new param definitions for FPGA ops

update FPGA ops declaration in types h and cpp file

Unify FUSION_CONVADDRELU_OP usage

fix android toolchain

fix #633 modify test cmake