Back ported a lot of changes made to the Koans directory.

Evidently, a lot of changes / pull requests were made to the koans
directory and not to the src directory.  Perhaps we should remove the
koans directory entirely from the repo.

koans/about_control_statements.rb

@@ -117,7 +117,7 @@ class AboutControlStatements < EdgeCase::Koan
     while i < 10
       i += 1
       next if (i % 2) == 0
-      result << i 
+      result << i
     end
     assert_equal __, result
   end