Test against edge Rails

gemfiles/rails_edge.gemfile

@@ -0,0 +1,15 @@
+source 'https://rubygems.org'
+
+gem 'rails', git: 'git://github.com/rails/rails.git'
+gem 'rack', git: 'git://github.com/rack/rack.git'
+gem 'arel', git: 'git://github.com/rails/arel.git'
+
+gemspec :path => '../'
+
+platforms :ruby do
+  gem 'sqlite3'
+end
+
+platforms :jruby do
+  gem 'activerecord-jdbcsqlite3-adapter'
+end