Enable/disable maps based on environment

[caitlineatman]

I'd like the source maps to be disabled based on environment. However, when I do this:
var devLikeEnvs = ['development'];

And then in my bundle options:
maps: devLikeEnvs

It doesn't work. I looked closer at the code and it appears that you can't set it by environment like you can other bundle options.

[chmontgomery]

This is true. I take PRs!