ISO 639-3 and 15924 updates

[Doug Ewell]

ISO 639-3/RA and ISO 15924/RA announced updates on the same day:

http://www-01.sil.org/iso639-3/cr_files/639-3_ChangeRequests_2015_Summary.pdf
http://unicode.org/iso15924/codechanges.html

Forms to apply these updates to the Language Subtag Registry will be
forthcoming. Please be patient. If you have a pressing need for one of
the new subtags, I can move it to the front of my queue.

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Doug Ewell | http://ewellic.org | Thornton, CO 🇺🇸