1. Convert OpenCL binary files to code.
2. example support OpenCL byte stream with --cl_binary_to_code flag.

1. Add registration of Op conditions.
2. Add data format for ops based on model's input data format.

This reverts merge request !931

1. dynamic_cast failed when one app integrated multiple MACE.

add onnx_optimizer tool and update onnx info in docs

1. Abstact android and arm linux to one format
2. Support cross compilation for ARM linux
3. Related issue #36

1. Add GPURuntime for GPUDevice
2. Move OpenCLRuntime to GPURuntime
3. Move ScratchImageManager from OPENCLRuntime to GPURuntime

fix 'sysconf(_SC_PAGESIZE)' to get page size, instead of 'getpagesize()' (which is not specified in POSIX.1)