New Features

• #2557: Record IP address on user creation
• Upload report (linked in site map)
• Support R key shortcut on /favorites
• enable mentions for new forum topic

Fixes

• #2462: An error on the upload page shouldn't wipe out the url/ref params
• modify robots.txt to exclude artists/new
• refactor aws config options
• fix aws calls in savedsearch
• remove unused scripts
• Rewrite nijie html view page to image url
• Remove configuration method enable_signups?