Include "Community" in Reply-To field
Limit recent threads to 3
Treat subscribers like a broadcast group
Use Group::Subscribers::ID constant instead of string
Fix post controller test
Only auto-subscribe people to threads broadcast to subscribers
Subscribers broadcast group names
Default to gravatar if avatar_url isn't set
Only set avatar url if user has photo
Explicitly require digest
Move shared post_params method into concern
Gravatar URLs over HTTPS
Merge branch 'subscribers-broadcast-group'
Merge branch 'email-field-improvements'