Convert hash into hash with indifferent access within resque jobs

Came across this bug during testing/documentation:

![screenshot 2014-10-30 22 29 00](https://cloud.githubusercontent.com/assets/123595/4855879/148f78a8-60ae-11e4-8423-e807cdc2e32f.png)

I don't entirely understand why they key can't be found. It's clearly there in the arguments.

Converting to a `HashWithIndifferentAccess` seems to do the trick. Must be a loss of information along the rails -> redis -> resque route.