fixes save function on models so that when a fire record is saved the last updated time stamp is updated automatically. I had it set so that if the last_updated timestamp was None it would update, but not on subsequent saves.
adds auto twitter hashtag based on fire name if one is not present, also adds year of fire based on date started. if one is not present, then it gets the year from the current day.
adds auto county slug formatting on save if none
adds exception to county slug in case there isn't a county name