### Feature and motivation

This has always been the default behavior for Ruby.

I think a lot of people are annoyed with how much extra stuff gets sent to the console (especially Firefox — https://github.com/mozilla/geckodriver/issues/619).

Once we document how to turn on logging for the drivers (I'm working on it), I think we should swallow the driver output by default and (maybe) direct people to the docs for how to turn it on/save it.

### Usage example

n/a
protected Map<String, String> getEnvironment() {
    return environment;
  }
  protected URL getUrl(int port) throws IOException {
    return new URL(String.format("http:localhost:%d", port));
  }
  protected Capabilities getDefaultDriverOptions() {
    return new ImmutableCapabilities();
  }
  protected String getDriverName() {
    return null;
  }
  protected String getDriverProperty() {
    return null;
  }
  protected File getDriverExecutable() {
    return null;
  }
  /**
   * @return The base URL for the managed driver server.
   */
  public URL getUrl() {
    return url;
  }
  /**
   * Checks whether the driver child process is currently running.
   *
   * @return Whether the driver child process is still running.
   */
  public boolean isRunning() {