added a Gemfile

Gemfile

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+source 'http://rubygems.org/'
+
+gem 'activesupport', '>= 2.3.0'
+gem 'i18n', '>= 0.4.2'
+
+group :development do
+  gem 'jeweler', '>= 1.4.0'
+  gem 'rspec', '>= 2.1.0'
+  gem 'yard', '>= 0.6.3'
+end

Gemfile.lock

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+GEM
+  remote: http://rubygems.org/
+  specs:
+    activesupport (3.0.3)
+    diff-lcs (1.1.2)
+    gemcutter (0.6.1)
+    git (1.2.5)
+    i18n (0.4.2)
+    jeweler (1.4.0)
+      gemcutter (>= 0.1.0)
+      git (>= 1.2.5)
+      rubyforge (>= 2.0.0)
+    json_pure (1.4.6)
+    rspec (2.1.0)
+      rspec-core (~> 2.1.0)
+      rspec-expectations (~> 2.1.0)
+      rspec-mocks (~> 2.1.0)
+    rspec-core (2.1.0)
+    rspec-expectations (2.1.0)
+      diff-lcs (~> 1.1.2)
+    rspec-mocks (2.1.0)
+    rubyforge (2.0.4)
+      json_pure (>= 1.1.7)
+    yard (0.6.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  activesupport (>= 2.3.0)
+  i18n (>= 0.4.2)
+  jeweler (>= 1.4.0)
+  rspec (>= 2.1.0)
+  yard (>= 0.6.3)