auto graph placement

* change paths

* add setup

* add packages

* update

* install ready

* restore mock

* restore graph_test.sh

* move visualdl.py to visualdl as a script

* fix setup

* remove onnx_pb2.py

* fix server_test

* add package into tests.sh

* add protobuf-compiler for package

* recover .git

* change script bin visualdl_bin to visualDL

* add npm cache

* avoid build_frontend in travis-CI

* avoid frontend build in travis-CI

* add pips

* restore protobuf mannul installation

* install protobuf

* fix package

* fix tool

* add graph mock data

* rm run parameter

* add simple MLP graph

* use json format for graph

* fix the tooltip index error

* frontend add graph

* optimize sampling

* fix comments

* len(data) only once

Merge branch 'feature/support_pytorch_demo' of github.com:ChunweiYan/VisualDL-1 into feature/support_pytorch_demo