[FEATURE] Load manifest.json from webserver instead of file

[tina-junold]

Hello,

im using the "webpack-dev-server" which is serving all files (including the manifest.json). While setting the public path for json/css to the server is uncritical, there should be the prossibility also set an url to the manifest:

webpack.manifest: "http://node:8080/static/manifest.json"
webpack.public_path_js: http://www.webpack.box:8080/static/
webpack.public_path_css: http://www.webpack.box:8080/static/