@ashfurrow => Add Admin section, start towards creating a new user

I've added an admin section so you can leave the app, or fall back to a webview + navigation. Currently hardcoded a password in to get out of the WebView. Added `DZNWebViewController` so that we don't have to do much for the webviews. [PR'd](https://github.com/dzenbot/DZNWebViewController/pull/6) some changes to it.

Started working on the networking for the user creation / user updating at the end of registration. I expect it will get quite complex there ( 2 types of auth, 2 methods for updating ) so I've thrown it into another class.

Ah, cool, so what we're missing here is something like:

```swift
var signal = RACSignal.empty()
        
signal =  signal.then  ...
```