470 External Nav

This brings in the initial work to have rxApp pull menu data from an external source.
or using reg ex and most likely less readable:

```
'//badly/written/path///test'.replace(/(?:\/\/+)/g, '/').split('/').slice(1)
[ 'badly',
  'written',
  'path',
  'test' ]
```
http://regexr.com/39ja6

Though this one probably is less accurate due to possibly checking for the slash in the beginning