Highlight USGS stations marked as outliers #29

When parsing the stationlist.json file from the USGS, stations marked as outliers are being included.

Add in the notebook 1_stations_usgs_json_to_csv.ipynb the option to highlight and remove outliers.

For example, for the event "20010213_M6.6_SanVicente" in El Salvador, the stations TO - Tonacatepeque and ZA - Zacatecoluca are highlighted as outliers.