Adds the ability to log in without activation

The app i'm developing requires the ability to log in without activation. (The app will then bug the user constantly about their account not being activated.)

There's an argument for moving this into the config file, making it affect all calls to Sentry::login(). But as the login method is not called much, it may be good to keep the option as a param, so it can be altered on a case-by-case basis.