console logs
assets precompile
added model callbacks, splash page, updated controller filter

1. Controller filter was updated so that it doesn’t redirect logged in
users trying to access a page that requires login
2. Model callback added to delete locations and favorites associated
with a list when a list is deleted
3. Added functionality to unfavorite a list (and make it available to
be refavorited later)
4. A find_by can be done on multiple columns with:
Favorite.find_by_user_id_and_list_id(session[:user_id], params[:id])
Fixed google map display bugs