Remove global entry path

So rendr is awesome. So awesome, that I want to have multiple rendr apps within one express instance.

This doesn't completely allow for that, but it's a little closer. These are the outstanding issues:

* modelUtils still isn't multiple app safe
* I haven't tried getting grunt to produce multiple out mergedAssets yet.

Let me know if you've got ideas about getting modelUtils to work across different rendr apps.

If you're interested in my specific use case I want to have a main app and an admin app. I don't want the main app to include all the templates for the admin app as they'd be useless.