General database clean-up

[aluhrs13]

• [x] Go through all creators and merge as appropriate
• [ ] Clean-up typo-ed and duped tags
• [ ] Categorize all active tags
• [x] Find and clean-up 404s
• [ ] Go through and update all "rejected" Minis

[aluhrs13]

Deferring until #197

[aluhrs13]

Merging with #207