Fix lookup for production bundles

This fixes the issue with distPath by removing all references to distPath and instead setting up default bundles paths when loading in production.

The user can then overwrite the location to the default entry point doing something like this:

```html
<script>
	steal = {paths: {"bundles/main": "other_dist/bundles/main.js"}};
</script>
```

The `main.js` will include paths to bundles for css and js files.