I'm going to let @jeffmo take a look at this. We had talked about some other ways to do it so I think we should solidify a plan with him before taking it further. One thing we actually got rid of before open sourcing was this default namespace. I think we should stick with that and instead make it possible for the tools (eg `bin/jsx`, `vendor/browser-transforms.js`) to specify the namespace. In React, they would specify `React.DOM` but some other library may want something else.