@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.

So this is going to cause a memory leak because the `exitAction` is owned by the controller, which now owns a block and has a strong reference to the `exitAction`. It's not a *huge* issue, since we're just leaking the alert VC and the action, so we can merge as-is, but we should open an issue to fix it.