just a trick to store int8 in protobuf

should limit the maximum image shape latter

support onnx as graph data format and add related API

* scalars frontend basically done

* frontend rename common/fun to util

* add images, scalar config

* add expandpael arrow

* fix scalars tooltip display problem

fix most bugs

waiting for frontend to fix interfaces

Update data format design

add graph data format design

* modified something in frontend directory

* modified gitignore

* remove node_modules

commit eb6d0cce
Author: superjom <superjom@gmail.com>
Date:   Mon Dec 25 19:48:28 2017 +0800

    code format

commit 353e1028
Author: superjom <superjom@gmail.com>
Date:   Mon Dec 25 19:47:46 2017 +0800

    restore