Merge pull request #65 from codeclimate/check_git_dir

Check that the `.git` directory exists when Rails.root is defined.

Author: calavera

lib/code_climate/test_reporter/git.rb

@@ -49,7 +49,13 @@ def git(command)
         end
 
         def git_dir
-          defined?(Rails) ? Rails.root : '.'
+          root = "."
+
+          if defined?(Rails) && File.directory?(File.expand_path(".git", Rails.root))
+            root = Rails.root
+          end
+
+          root
         end
       end
     end