add unicorn support
update gemfile
fix unicorn config
disable prefork/postfork code
split out unicorn config into environments
fixes #1350, better db:seed script
fixes #1349
fixes #1349
fixes #1337
fixes #1333
bug fix
alternative to tag cache fetch to see if it works better
fixes #1285
add tests for user promotion/demotion admin interface
partial fix for #1287
Merge branch 'master' of github.com:r888888888/danbooru