move concerns to the model/concerns
escape gravatar URLs to comply with W3C standards

This fixes an HTML validation error due to & not being properly escaped on the gravatar URLs.
fixes user specs about ampersands in gravatar URLs
add pluralization rules in ember for Korean (ko)
remove unnecessary css witdh
SECURITY: self XSS by admin by editing badge name
UPGRADE: sidekiq to sidekiq 3.0
FEATURE: alllow unicorn master to fork sidekiqs, keep alive coming
FEATURE: unicorn sidekiq will restart sidekiq on complete failure.

(checks every 30 minutes for complete failure)
BUGFIX: caching sass is not valid due to "import" being used
BUGFIX: backups logs page was busted since last Ember update
Update README.md
Update README.md
FEATURE: warn the admin whenever we disable the download_remote_images_to_local site setting
display the copy & paste images hint to FF users too
Merge pull request #2288 from yomybaby/i18n_plural_ko

add pluralization rules in ember for Korean (ko)
slightly improve disk space limit reached message
FIX: Admins should always be able to see groups so they can edit them.
REFACTOR: Add urls for admin groups, make it more idiomatic ember
FIX: NotifyMailingListSubscribers can handle trashed posts, instead of raising an error and retrying