STIX Patterning quick reference card

Hey, y'all -

I distilled the 34 page STIX Patterning spec down to a quick reference
card. Thanks to Ivan Kirillov, Jason Keirstead, John-Mark Gurney, and
John Wunder for helpful feedback! Hope this is a useful resource for
you all. ^_^

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Cheers,
Trey
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Director of Standards Development, New Context
gpg fingerprint: 3918 9D7E 50F5 088F 823F  018A 831A 270A 6C4F C338
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"It is always something." --RFC 1925