OpenTreeMap/OTM2 — pull request #1686 by kdeloach (2014-10-02 21:06:40+00:00)
Title: Only generate source maps via grunt-watch if --dev flag is used.

I had to make this configurable because using source maps in Chrome is very sluggish on my machine. I'm not sure if this should be on or off by default but I figured it makes sense to reuse the `--dev` flag for this.