Add Rails 4.1 to test list

Closes #38

Author: zpao

Appraisals

@@ -17,3 +17,7 @@ appraise "rails-4.0-with-therubyracer" do
   gem 'rails', '~> 4.0'
   gem 'therubyracer', '0.12.0', :platform => :mri
 end
+
+appraise "rails-4.1" do
+  gem 'rails', '~> 4.1'
+end

gemfiles/rails_4.1.gemfile

@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "http://rubygems.org"
+
+gem "rails", "~> 4.1"
+
+gemspec :path=>"../"