Make *Number subproperties of "position"
Make *Number subproperties of "position"

Per http://lists.w3.org/Archives/Public/public-vocabs/2014Aug/0140.html,
make episodeNumber, seasonNumber, issueNumber, and volumeNumber
subproperties of position, and make CreativeWork the domain for
position. Adjust the definition of position accordingly.

Signed-off-by: Dan Scott <2591e5f46f28d303f9dc027d475a5c60d8dea17a@coffeecode.net>

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