transferred Code Ocean from original repository to GitHub

db/migrate/20140812150925_remove_file_related_columns_from_exercises.rb

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+class RemoveFileRelatedColumnsFromExercises < ActiveRecord::Migration
+  def change
+    remove_column :exercises, :reference_implementation, :text
+    remove_column :exercises, :supports_user_defined_tests, :boolean
+    remove_column :exercises, :template_code, :text
+    remove_column :exercises, :template_test_code, :text
+    remove_column :exercises, :test_code, :text
+  end
+end