Fix other require issues (bbmodal)

[willzeng]

@davidfurlong So have logged a few more hours trying to squash this.

Tried:

• http://stackoverflow.com/questions/13331484/requirejs-shim-want-to-register-backbone-plugins-directly-into-core-backbone
• and shim init: https://twitter.com/lmjabreu/status/315009976064155648
• and amending the anonymous define in the backbone-modal repo

and a few other play arounds. I guess I still just don't understand the error well enough to know how to fix it. Did you get in touch with Adam at all about it?

[willzeng]

Basically this just needs to have the implementation cleaned up.