* scalars frontend basically done

* frontend rename common/fun to util

* add images, scalar config

* add expandpael arrow

* fix scalars tooltip display problem

* modified something in frontend directory

* modified gitignore

* remove node_modules

* scalars frontend basically done

* frontend rename common/fun to util

* init logdir runs tags and scalars interface

* add debug

* add one mock data

* add dir server

* move frontend to server

* optimizer python package

* add mock data

* add back result encode

* use application/json as Response type

* rm .DS_Store

* update mock tags

* update mock data