Proposal: Catch::Tags(...)

Hello,

I wrote a set of *Catch::Tags(...)* variadic template functions to help support a thing I wanted to do: namely, present my tags as individually named, or as vectors of tags, and so on, without necessarily concerning myself with the *[square][bracket][syntax]*. Thus far it's working out great.

Thought y'all might like to take a look. Currently it is in [header](http://github.com/mwpowellhtx/cppnngswig/blob/master/swig/cpp/tests/catch/catch_tags.h) and [source](http://github.com/mwpowellhtx/cppnngswig/blob/master/swig/cpp/tests/catch/catch_tags.cpp) form, but perhaps it can exist as header only, I'm not sure.

And with a [usage example](http://github.com/mwpowellhtx/cppnngswig/blob/master/swig/cpp/tests/transport/transport.cpp#L124).

Cheers.