Merge pull request rack#186 from kickstarter/rails5

Add tests for ActiveSupport 5.0

Author: ktheory

gemfiles/activesupport5.0.gemfile

@@ -0,0 +1,15 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activesupport", "~> 5.0.0"
+gem "actionpack", "~> 5.0.0"
+gem "listen", "<= 3.0.6", platforms: [:ruby_21, :jruby]
+
+group :development do
+  gem "pry"
+  gem "guard"
+  gem "guard-minitest"
+end
+
+gemspec :path => "../"