Added Buycraft, Enjin, and SecureSafe

For future reference, Buycraft supports App (Google Authenticator), Enjin is paid-only and supports SMS and App (Authy), and SecureSafe is paid-only and supports SMS (DoubleSec is only for automatic login for the app, not getting the otp from the app itself).
Merge pull request #37 from jamcat22/patch-1

Added Buycraft, Enjin, and SecureSafe