function FileServer(config) {
        BaseServer.call(this, config);
    }
Server for file: URLs

Configuration parameters for this server:
- baseUrl      - Optional base URL (populated by the current project)
- pathResolver - Function to covert absolute native paths to project relative paths
- root         - Native path to the project root (and base URL)

@constructor
@param {!{baseUrl: string, root: string, pathResolver: function(string): string}} config
@extends {BaseServer}