Add basic Pubsubhubbub support
Add a migration to update Pubsubhubbub hubs locations
Fix Pubsubhubbub callback
Authorize manual folder syncs for Pubsubhubbub feeds
Add an icon when a feed is configured to use Pubsubhubbub
Fix Pubsubhubbub updates by fetching the correct topic url
Make Pubsubhubbub updates asynchronous
Update gems
Fix the Pubsubhubbub hub existence check in feed creation route
Add the feed id to the Pubsubhubbub callback url
Use the feed's self link for the Pubsubhubbub topic url
Add topic update to Pubsubhubbub migration
Add automatic Pubsubhubbub resubscription on expiration
Small bugfix in pshb route
Add Pubsubhubbub unsubscribe support
Fix expiration check of feeds without a pshb expiration
Make sure the pshb topic URL is a valid URL, and use the feed url if it isn't
Show PSHB informations in the feed edit dialog
Update PSHB section in feed edit dialog
Small translation fix