code: public ExtWebDriver getNewSession(Map<String, String> override) throws Exception {
          return getNewSession(override, true);
      }
docs: Create and return a new ExtWebDriver instance. The instance is
  constructed with default options, with the provided Map of key/value
  pairs overriding the corresponding pairs in the options. This new
  ExtWebDriver instance will then become the current session.
  
  @param override
  A Map of options to be overridden
  @return A new ExtWebDriver instance which is now the current session
  @throws Exception