Remove Settings component on Login view

[iamkevinlowe]

Settings button, leading to LOG OUT is shown on Login view.

[dpaola2]

I investigated this a bit, posting here for posterity.

The reason this occurs is because the index.ios.js component includes the Settings component from within its rendered NavigatorIOS component (as a property).

One solution is to extract a separate NavigatorIOS component for the logged-out view vs. the logged-in view. That seems like overkill to me.

Another solution would be to simply include the Settings component and render different contents depending on whether or not the user is logged in.