Upgrade NPM dependencies (#515)

* upgrade gulp

* upgrade gulp config

* ** gulp 4

* fix import

* upgrade babel

* eslint --fix

* oh my eslint

* Fix PrismJS

* Upgrade some dependencies

* roll back gulp-iconfont

* fotgot to stage lockfile

* webpack finally works

* Revert "webpack finally works"

This reverts commit ca7b921

* some fixes

* Update README

* upgrade gulp-iconfont

* Fix uglifyjs-webpack-plugin

* some fixes make react works fine

Author: moesoha

.eslintignore

@@ -0,0 +1 @@
+/vj4/ui/static/**

README.md

@@ -45,7 +45,7 @@ There is pre-built docker package at `vijos/vj4`. This is maintained by [@moesoh
 
 * [Python 3.5.3+](https://www.python.org/downloads/)
 * [MongoDB 3.0+](https://docs.mongodb.org/manual/installation/)
-* [Node.js 6.0+, 10-](https://nodejs.org/en/download/package-manager/)
+* [Node.js 6.0+](https://nodejs.org/en/download/package-manager/)
 * [RabbitMQ](http://www.rabbitmq.com/)
 
 #### Install requirements
@@ -57,7 +57,7 @@ python3 -m pip install -r requirements.txt
 npm install   # cnpm install
 ```
 
-You don't need root privilege to run `npm install`. It installs stuffs in the project directory. We recommend using Node 8. Node 10 brings breaking changes, which can break our deprecated dependencies.
+You don't need root privilege to run `npm install`. It installs stuffs in the project directory. We recommend using Node 8.
 
 You may want to use [cnpm](https://npm.taobao.org/) and [tuna](https://pypi.tuna.tsinghua.edu.cn/)
 if you are in China. Make sure to use `cnpm` by adding `alias` to `npm` instead of installing cnpm cli-tool.