allow for cereal to be applied to template classes with multiple arguments #141
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This uses VA_ARGS instead of T in the macro argument list to allow for template classes with multiple arguments. I think it should be strictly more functionality and not break anything that worked before (but I might be wrong). Also, I didn't touch CEREAL_REGISTER_TYPE_WITH_NAME because I would have had to switch the argument order in the macro to use VA_ARGS, which would definitely break things.