Add Gemfile for running the tests

Gemfile

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+source 'https://rubygems.org'
+
+group :test do
+  gem 'heroku'
+  gem 'rr'
+  gem 'rake'
+  gem 'rspec'
+end

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.3.2)
+    diff-lcs (1.1.3)
+    excon (0.16.7)
+    heroku (2.33.0)
+      heroku-api (~> 0.3.5)
+      launchy (>= 0.3.2)
+      netrc (~> 0.7.7)
+      rest-client (~> 1.6.1)
+      rubyzip
+    heroku-api (0.3.6)
+      excon (~> 0.16.7)
+    launchy (2.1.2)
+      addressable (~> 2.3)
+    mime-types (1.19)
+    netrc (0.7.7)
+    rake (10.0.3)
+    rest-client (1.6.7)
+      mime-types (>= 1.16)
+    rr (1.0.4)
+    rspec (2.12.0)
+      rspec-core (~> 2.12.0)
+      rspec-expectations (~> 2.12.0)
+      rspec-mocks (~> 2.12.0)
+    rspec-core (2.12.2)
+    rspec-expectations (2.12.1)
+      diff-lcs (~> 1.1.3)
+    rspec-mocks (2.12.1)
+    rubyzip (0.9.9)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  heroku
+  rake
+  rr
+  rspec