exercism/exercism.io — pull request #1525 by arthurnn (2014-03-25 17:51:11+00:00)
Title: Update AR and AS to 4.0.4

Before updating ruby to 2.1.1 (#1522) . We need to make sure we are running AR, AS 4.0.4+.

read this http://blog.sorah.jp/2014/03/10/hash-reject-regression-in-ruby211