Helper method to check if an user is an admin
Sudo make me a sandwich

Create sudo ability for admins to sudo into anybody to test stuff up!
But available only in development.
Add some sample members as seed data for users
Clean up Sudo routes and controller
Rename Sudo to Su
Merge pull request #1 from hackerschool/su

Style cleanup for Su
Fixing code review suggestions
Clean up email fields
Serialize user ids instead of users for delayed jobs
Send mail to a list address, BCCing users
Fix test
Pass user IDs in mailer previews
Merge branch 'master' into emails-to-list
list -> lists
reply_to_thread_address => reply_to_post_address
Fix notification count icon positioning
Add pinned attribute to threads
Pinned threads at the top!
Show a list of users to select when trying to su
Admin can pin/unpin threads in the thread view