Modifyied the OpentokApiHelper class to no longer use the API secret. Instead, I am point to a RESTful resource that provides a session and token using the server SDK.
Removing API secret from OpentokAPICredentials class
Added OpentokRoomSelectorViewController to allow the user to pick the room they want to join. Modifyied the main ViewController class to use the updated OpentokApiHelper class.
Adding Xcode provided default retina image to remove warning.