- Modified batata_fetcher.ini config options.
- Added the following methods to BatataFetcher :
  _pidfile_exists, _write_pidfile, _remove_pidfile, _install_signal_handler &
  _shutdown_fetcher.
- Added property run_fetcher to BatataFetcherParser, this property
  allows to properly shutdown the fetcher.
- If no config file is specified when initiating the fetcher an exception is
  thrown.
Merge branch 'master' of github.com:chequeado/batata-translator