Gemfile.rails-4.0-stable in devise-3.5.9

- old
+ new

@@ -4,9 +4,10 @@
 
 gem "rails", github: 'rails/rails', branch: '4-0-stable'
 gem "omniauth", "~> 1.2.0"
 gem "omniauth-oauth2", "~> 1.1.0"
 gem "rdoc"
+gem "mime-types", "~> 2.99"
 
 group :test do
   gem "omniauth-facebook"
   gem "omniauth-openid", "~> 1.0.1"
   gem "webrat", "0.7.3", require: false