User should be able to login/logout

[prdx]

• Possible method to login:

1. Facebook
2. Google
3. Manually register

• Link like dashboard/* should not be able to be accessed without login.

• After the user has logged in, during certain period, user can access without login anymore, unless the user has logged out.

• Display the login button at the home page

• Display the logout button at the app bar.