message: feat: allow custom config to be passed
diff: +import * as Path from 'path';
  import { ReadStream, WriteStream } from 'tty';
  import { Loader, LoaderProperties } from 'componentsjs';
  import yargs from 'yargs';
  @@ -23,15 +24,21 @@ export const runCustom = function(
  .usage('node ./bin/server.js [args]')
  .options({
  port: { type: 'number', alias: 'p' },
  + config: { type: 'string', alias: 'c' },
  })
  .help();
  new Promise<RuntimeConfig>(async(resolve): Promise<void> => {
  + // Load provided or default config file
  + const configPath = argv.config ?
  + Path.join(process.cwd(), argv.config) :
  + `${__dirname}/../../config/config-default.json`;
  +
  // Setup from config file
  const loader = new Loader(properties);
  await loader.registerAvailableModuleResources();
  const setup: Setup = await loader
  - .instantiateFromUrl('urn:solid-server:my', `${__dirname}/../../config/config-default.json`);
  + .instantiateFromUrl('urn:solid-server:my', configPath);
  resolve(await setup.setup({ port: argv.port }));
  }).then((runtimeConfig: RuntimeConfig): void => {
  stdout.write(`Running at ${runtimeConfig.base}\n`);
  