[feature] whitelist controversial and min_score

[bjuergens]

Background: As someone who sorts by controversial, I'd like to preserve my own controversial comments for future generations.

Problem: shreddit deletes them

Solution: Add 2 new options to shreddit.yml:

• min_score: Min score, lower than this and it'll be kept (similar to max_score)
• whitelist_controversial: ignore controversial comments (similar to whitelist_gilded and whitelist_distinguished)

You can get the controversialness in praw via controversiality from comment-objects (as explained here)

[mrcbax]

As someone who knows future employers may grok my Reddit profile I feel that also adding the option to remove controversial or posts with a low amount of upvotes would be a great way to clean up your profile while still leaving comments that the community likes. That way we don't mess up helpful history.

Edit: wow that was a run on. Fixed now.