DEV: remove seed-fu pinning from rails master

DEV: remove seed-fu pinning from rails master

This pinning should no longer be needed

diff --git a/Gemfile b/Gemfile
index 24f5f69..29797ed 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,6 @@ end
 if rails_master?
   gem 'arel', git: 'https://github.com/rails/arel.git'
   gem 'rails', git: 'https://github.com/rails/rails.git'
-  gem 'seed-fu', git: 'https://github.com/SamSaffron/seed-fu.git', branch: 'discourse'
 else
   # until rubygems gives us optional dependencies we are stuck with this
   # bundle update actionmailer actionpack actionview activemodel activerecord activesupport railties

GitHub sha: 448ea663