Merge pull request #140 from vikhyat/favorites

Favorite anime
Only let admins create "Site News & Updates" topics.
Add username blacklist.
KiwiIRC for chat.
September newsletter.
Allow async email sending.
uhhhhhh
Update HB newsletter
Subtle copy change
Seriously.. last copy change.
Fix typo because I'm stupid
Anime aired "on <date>" when start date = end date.
Switch validation format to Discourse-style.
Minor update to get Facebook usernames to fit the validation.
Get rid of Facebook username dashes.
Even better FB username selection.
Add doorkeeper gem.
Admin authentication.
Add OAuth controller.
ugh