add a new class to get a md5sum without taking the exif data (as it contains the tweet that always change)
add a deleted friends cache
split code in one function
display when the script exit because of a ratelimit
when refreshing the friend list, remove deleted one and put them in deleted_friends cache
easy access to deleted_friends cache
add a docstring for ponderated_weights property
remove useless debug log
change the way we build the log messages