code: public Observable<Integer> run(InputStream is, String delimiter) {
          return run(is, Charset.defaultCharset(), delimiter);
      }
docs: Returns an {@link Observable} that is the result of running a sequence of
  update commands (insert/update/delete, ddl) commands read from an
  InputStream using the given delimiter as the statement delimiter (for
  example semicolon).
  
  @param is
  @param delimiter
  @return