harukizaemon/hamster — pull request #14 by misfo (2012-09-30 15:01:23+00:00)
Title: Hamster::Hash#fetch to match Ruby's ::Hash#fetch

I find [fetch](http://ruby-doc.org/core-1.9.3/Hash.html#method-i-fetch) really useful when I want my code to complain loudly when the key doesn't exist