Public path is hard-coded as localhost

[fweep]

This isn't necessarily a bug, but it's potentially confusing. When you start the server with the default config/webpack.config.js, it prints:

 webpack result is served from //localhost:3808/webpack/

While this is true in the default case, if you start it with a custom host binding, like this:

webpack-dev-server --config config/webpack.config.js --host 10.0.0.100

Then the hard-coded localhost is a bit misleading. Since webpack-dev-server already prints the host and port binding on the line immediately prior, it might make sense to just limit the publicPath setting to the actual file path (/webpack). For example:

 http://10.0.0.100:3808/webpack-dev-server/
webpack result is served from /webpack/

In reading the webpack-dev-server documentation, it looks like publicPath is supposed to be relative, but I'm still learning, so I'm not sure, but it works for me with just the relative path setting.