Added Ruby requirements.

Gemfile

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+source "https://rubygems.org"
+
+group :media do
+  gem "compass", "~>0.12.2"
+  gem "sass", "~>3.2.5"
+  gem "susy", "~>1.0.5"
+end
+
+group :development do
+  gem "foreman", "~>0.61.0"
+end

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    chunky_png (1.2.7)
+    compass (0.12.2)
+      chunky_png (~> 1.2)
+      fssm (>= 0.2.7)
+      sass (~> 3.1)
+    foreman (0.61.0)
+      thor (>= 0.13.6)
+    fssm (0.2.10)
+    sass (3.2.5)
+    susy (1.0.5)
+      compass (>= 0.12.2)
+      sass (>= 3.2.0)
+    thor (0.17.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  compass (~> 0.12.2)
+  foreman (~> 0.61.0)
+  sass (~> 3.2.5)
+  susy (~> 1.0.5)