Add xCal.

See RFC6321.
Add xCard.

See RFC6351.
[auto] Merge from Mime

    • #aa8f319 — Add xCal. (Ivan Enderlin, 2014-11-12)
    • #fae2a9c — Add xCard. (Ivan Enderlin, 2014-11-12)

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Merge branch 'master' of /var/lib/git/repositories/Library/Mime