#645 Add facebook omniauth middleware

config/initializers/omniauth.rb

@@ -1,4 +1,5 @@
 Rails.application.config.middleware.use OmniAuth::Builder do
   provider :twitter, ENV['GROWSTUFF_TWITTER_KEY'], ENV['GROWSTUFF_TWITTER_SECRET']
   provider :flickr, ENV['GROWSTUFF_FLICKR_KEY'], ENV['GROWSTUFF_FLICKR_SECRET']
+  provider :facebook, ENV['FACEBOOK_KEY'], ENV['FACEBOOK_SECRET']
 end