Fix #231: tokens.xml no longer overwritten by cards.xml.

Apparently the fix was exactly as simple as I thought it wasn't. @Psithief does this fix the issue?
@Daenyth Do you mean you want me to rename the function to `isToken()`? If I do that then it conflicts with the private members `isToken`, and if I rename that then I'd have to rename all of the other private members for consistency.