Mass delete unrated generations.

Currently it’s really hard to scroll through old generations to clean up. The site makes scrolling through old generations tedious and time consuming. Being that we’re encouraged to give feedback on the generator and it doing so makes finding old stuff to revisit easier (still needs work but it’s easier). Being able to mass delete old unrated generations would help both us end users and your server space. The downvote option is not a good one since it (extremely annoyingly) asks for feedback on every single downvote.