Khan/khan-exercises — pull request #27555 by xymostech (2012-08-07 23:18:12+00:00)
Title: Stop all the dumb garbage collection in build/pack.rb

I don't see any weird side effects of this, and it returns 0 like normal
as well. I think it should be safe, but someone might want to do some
additional checking.

@beneater @spicyj