Document actions available in API

[tayden]

It would be great if the redux actions that can be imported from redux-auth were documented somewhere.

For example, I have some drop down menus with a logout option that I want to trigger a signOut action on click. Ideally this would call the same action used internally by redux-auth's SignOutButton component. I'd similarly like be able to call the oAuthSignIn action, but it's difficult to tell what the function parameter expectations are without proper documentation.