Khan/khan-exercises — pull request #71539 by theinternetftw (2013-09-06 03:45:04+00:00)
Title: Fixes a random seed of zero being ignored

This was caused by zero being interpreted as false.
Hurray loose typing! Hurray Javascript!

You can test by loading up any exercise in sandcastle, e.g
http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/reading_pictographs_2.html?seed=0
and repeatedly reloading the page.