added card_set.description to columns to be scrubbed
added and set columns in card_set, fixed watermarks issues 3-5, 7
https://github.com/jenlarkin/judgingyou-decks/issues/3
https://github.com/jenlarkin/judgingyou-decks/issues/4
https://github.com/jenlarkin/judgingyou-decks/issues/5
https://github.com/jenlarkin/judgingyou-decks/issues/7